Texas Garden Guide for September

Anyone else daydreaming about pumpkin spice lattes, vibrant orange coral bells that I’ll inevitably try to force into surviving on my balcony, and a big bowl of squash soup? I know I can’t be the only one who is completely over this oppressive summer heat, and I say that as someone who actually loves summer. Texas has simply taken it too far this year!

Thankfully, cooler weather is finally on the horizon, which means September is right around the corner. And with a new month comes a new blog series because apparently I’ve decided I don’t already give myself enough things to write: the Texas Garden Guide.

Technically, this is going to be more of a monthly Texas botany guide, but we must occasionally bow to the SEO overlords and give things names people are actually searching for. The upside is that you’re getting a whole lot more than just garden updates. Each month, I’ll cover what to do in your Texas garden, what’s blooming out on local trails and nature walks, seasonal plants to keep an eye out for, and a botanical bucket list of things to see, plant, or do before the month is over. Basically, I’m giving you an excuse to become the person who points at random plants on a walk and says, “Oh, I know what that is.”

So, before we head out on the trail and start identifying every wildflower within a five-foot radius, let’s start at home with a few things you can do now to get your garden ready for September.

September Garden to-do list

Alright, I’m going to divide this list into two sections: your September outdoor garden to-do list and your September houseplant to-do list! I try my best to cater to all kinds of plant lovers here at The Botanical Texan, so whether your indoors looks like a lush little jungle or your outdoors is overflowing with raised beds and blooms, I’ve got you covered. After all, September is a transition month for all of our plants, even the ones lucky enough to live in the air conditioning.

September outdoor garden to-do list

• Start planting fall perennials and Texas natives | As the weather finally begins to cool down, late September through fall is one of the best times to get new plants in the ground! Planting in the fall gives them plenty of time to settle in, establish their roots, and get comfortable in their new home without immediately being thrown into the absolute survival test that is a Texas summer. A few great plants to consider adding to your garden are:
  • Fall Aster (Symphyotrichum oblongifolium)
    A Texas fall garden MVP. It blooms purple to violet from September into November and is especially valuable for bees, butterflies, and migrating monarchs. Fun fact: if your summer garden is looking a little crispy and defeated, fall aster is basically here to make everyone forget what happened in July.
  • Indian Blanket / Blanketflower (Gaillardia pulchella)
    One of those plants that just looks aggressively Texan in the best way. Its red and gold flowers can keep blooming well into fall, and it handles heat, poor soil, and drought like an absolute champ. Fun fact: it can also host Gorgone Checkerspot and Bordered Patch caterpillars, so you’re basically planting a tiny butterfly nursery.
  • Fragrant Mistflower (Ageratina havanensis)
    This one gets covered in fluffy pinkish-white blooms and can flower from spring all the way into December. Butterflies, hummingbirds, and even night-flying moths love it.
  • Lanceleaf Coreopsis / Lanceleaf Tickseed (Coreopsis lanceolata)
    A cheerful yellow flower that is technically a perennial, although it tends to live fast, self-seed, and pop back up wherever it pleases.
  • Blackfoot Daisy (Melampodium leucanthum)
    A compact little native covered in white, honey-scented flowers that absolutely loves blazing sun and dry, rocky soil. It can bloom from spring well into November.
• Plant cool-season vegetables | Can’t forget to have a side of veggies with that pumpkin spice latte! September is a great time to start planting a few cool-season vegetables directly from seed. Now, I’m wondering if I grow the vegetables myself, will my fiancé feel obligated to eat them? Food for thought… literally. Anyway, while I test that theory, here are a few vegetable seeds you can start planting in September:
  • English/French Peas
  • Pinto Beans
  • Bush Beans
  • Chinese Cabbage
  • Swiss Chard
  • Radish
  • Turnips
  • Collard Greens
  • Lettuce
  • Kale
  • Beets
  • Carrots
  • Parsnips
• Divide spring-blooming perennials | Once temperatures start to cool, September can be a great time to divide and transplant perennials like daylilies and irises. The milder weather gives them time to settle in and establish roots without immediately fighting for their lives in the Texas heat.
• Give tired perennials a cleanup, but don’t go crazy | Remove genuinely dead or diseased material, but leave healthy seedheads standing when possible. They provide an important natural food source for birds throughout fall and winter, especially as insects and other foods become harder to find.
• Keep deadheading selectively | Deadhead plants you want to encourage to continue blooming, while allowing plants you want to reseed to develop seed.
• Collect native seeds | Watch for mature seed from summer-blooming natives and prairie plants.
• Watch the watering | September can still be brutally hot and dry in North Texas. Because of that, newly planted material especially needs consistent water while establishing.
• Refresh mulch | It’s a good idea to give your mulch a little seasonal refresh! Replenishing any thin or bare areas helps protect your plants’ roots, retain moisture, and keep weeds from getting too comfortable.
• Evaluate your summer garden | Take a few photos and notes while the evidence is still fresh! Which plants sailed through August like Texas heat was no big deal? Which ones demanded water every five minutes? And which ones completely fried? Consider this your garden’s annual performance review. You’ll thank yourself when it’s time to make changes this fall!

September houseplants to-do list

Just because houseplants get to live the life of luxury indoors, casually watching their outdoor compadres suffer through the Texas heat, doesn’t mean they’re completely off the hook in September! As the days get shorter and growth begins to slow, there are still a few things you can do to help them adjust to the seasonal shift ahead.

• Check the light | Days are getting shorter and the sun angle is changing. A plant that received plenty of indirect light in July may need to move closer to a window.
• Adjust your watering schedule. | Don’t keep watering just because Tuesday has always been watering day. As growth slows, a lot of houseplants won’t be nearly as thirsty, so check the soil first and let the plant tell you what it needs.
• Give everyone a little spa day | Wipe the dust off larger leaves and give plants that tolerate it a quick shower or rinse. Clean leaves not only look prettier, they’re also better able to soak up what little winter light we’re about to get.
• Do a pest check | Flip over leaves, check stems, and take a good look at new growth for spider mites, scale, mealybugs, and fungus gnats. Basically, make sure nobody has invited unwanted roommates in for this fall semester!
• Get outdoor houseplants ready to come inside | If your tropicals spent the summer outdoors, September is the time to start planning their grand return indoors. Inspect them carefully, clean them up, and quarantine them before tossing them back in with the rest of your collection. We are not bringing hitchhikers into the house.
• Take a few cuttings | September is a great last chance to propagate pothos, philodendron, tradescantia, and other easy growers while they’re still actively growing. Because apparently the answer to having too big of a plant, is to make more plants.
• Ease up on fertilizer | As growth starts slowing, your plants usually don’t need the same heavy feeding schedule they did in summer. Start backing off so you’re not feeding them like it’s July when they’ve mentally already entered cozy season.
• Rotate your plants | Give pots a little quarter turn every so often so they keep growing evenly as the direction of the window light changes. Nobody wants one side thriving while the other side is desperately reaching for the sun.
• Check your soil and drainage | If water is suddenly racing straight through the pot or sitting on top forever, your soil may be compacted or hydrophobic. It’s worth investigating before your plant starts sending out distress signals.
• Don’t go on a repotting spree | Repot plants that genuinely need it, but September does not need to become the month where every plant in your house gets evicted and moved into a new pot. Save yourself the chaos.
• Take inventory before winter | Look around and figure out who is going to need a better window, a grow light, a humidifier, or a whole new setup once the days get noticeably shorter. Think of it as your houseplant winter-prep checklist.

Whats blooming in Texas in september?

Okay, so your indoor and outdoor gardens are refreshed and officially ready to sit back and judge you while you sip yet another pumpkin spice latte. At this point, I’m starting to think this post is secretly sponsored by pumpkin spice with how often I’ve mentioned it.

Now, what can you expect to see blooming out and about in Texas during September? This is one of my favorite parts of the seasonal shift! We may not get the full storybook fall with crisp leaves and sweater weather on demand, although Chinese pistaches do their absolute best to give us a little drama. However,Texas still knows how to put on a fall show.

Prairie purples get a little deeper, golden yellows start taking over, grasses begin going to seed, and suddenly everything feels just a little more autumnal… even if it is still 90 degrees outside and your sweater is purely decorative.

• Snow-on-the-prairie (Euphorbia bicolor)
  If Texas had its own version of the first snowfall, this might be it. The tiny flowers are surrounded by white-edged bracts that can make whole patches of prairie look like they have been dusted with snow. It starts blooming in late summer, but September is still a great time to catch it. This is honestly my personal favorite flower that blooms!
• Leavenworth’s eryngo (Eryngium leavenworthii)
  One of the weirder and more wonderful signs of fall on a Texas prairie. Its spiky purple flower heads almost look like little thistles and add a deep purple color that feels perfectly at home with the warmer colors beginning to show up around it.
• Gayfeather / blazing star (Liatris spp.)
  Those tall purple flower spikes are hard to miss poking up through the prairie grasses. Different species bloom across Texas, but collectively they are one of my favorite ways our prairies start transitioning from summer into fall.
• Goldenrod (Solidago spp.)
  Here comes the gold! Goldenrod is one of those plants that makes the shift into fall really obvious. Its bright yellow flowers start lighting up roadsides and prairies just as the grasses around them begin taking on warmer, straw-colored tones.
• Maximilian sunflower (Helianthus maximiliani)
  If goldenrod wasn’t enough yellow for you, September also brings towering Maximilian sunflowers. They can grow into huge colonies covered in golden blooms, making them one of the showiest signs that Texas prairie season is heading into fall.
• Western ironweed (Vernonia baldwinii)
  Ironweed brings some seriously rich fall color without a single changing leaf. Its clusters of deep purple flowers stand out beautifully against all the golds, tans, and yellows beginning to creep into the September prairie.
• Frostweed (Verbesina virginica)
  The name alone sounds promising when you’re desperately waiting for Texas summer to end! Frostweed begins producing clusters of white flowers in late summer and fall, long before our first actual frost arrives. Come winter, though, this plant has another trick up its sleeve when freezing temperatures can create beautiful ribbons of ice around its stems.
• Gregg’s mistflower (Conoclinium greggii)
  September isn’t just the beginning of fall wildflower season. It is also butterfly season! Gregg’s mistflower produces fluffy lavender-blue flowers that butterflies absolutely flock to, making it an especially fun plant to look for as fall migration picks up.
• Fall aster (Symphyotrichum oblongifolium)
  It literally has fall in the name, so of course it had to make the list. Its masses of little purple daisy-like flowers are one of those plants that can finally make Texas look like autumn, even when the weather has clearly not received the memo.
• Pitcher sage / azure blue sage (Salvia azurea)
  Tall, wispy stems of true blue flowers start weaving their way through prairie grasses in late summer and fall. Against September’s increasingly golden landscape, that clear blue color is especially pretty.
• Mealy blue sage (Salvia farinacea)
  This Texas native is a marathon bloomer, so September is hardly its first appearance. Its blue-purple flower spikes often keep right on going into fall, providing some cooler color among all those emerging yellows and golds.
• Scarlet sage (Salvia coccinea)
  Scarlet sage is another plant that refuses to call it quits just because summer is technically ending. Its bright red tubular flowers can continue into fall and are particularly welcome to hummingbirds.
• Turk’s cap (Malvaviscus arboreus var. drummondii)
  While the prairies are turning gold and purple, woodland edges are still putting on their own show. Turk’s cap continues producing its quirky red flowers into September, followed by little red fruits that make the plant feel even more fall-ish.
• Cowpen daisy (Verbesina encelioides)
  Another splash of Texas fall yellow! Cowpen daisy can continue blooming well into our warm fall season, covering roadsides and open areas with little sunny flowers while also providing nectar for late-season butterflies.
• Partridge pea (Chamaecrista fasciculata)
  Partridge pea is another summer bloomer that doesn’t immediately disappear when September arrives. Its yellow flowers can still be scattered through prairies and open areas, eventually giving way to dark seedpods as the season progresses.
• Prairie wild petunia (Ruellia humilis)
  Look a little closer to the ground and you may find these soft purple, trumpet-shaped flowers hiding among the grasses. They are another bit of purple that fits perfectly into the changing palette of the September prairie.
• Bitterweed (Helenium amarum)
  If you’ve driven past a field covered in tiny yellow flowers in North Texas, there is a decent chance bitterweed was involved. It can bloom abundantly into fall and is one of those plants that may not seem remarkable individually but looks pretty magical when there are thousands of them.
• Pigeonberry (Rivina humilis)
  Pigeonberry is doing a little bit of everything by September. You can find its delicate pinkish-white flowers alongside shiny red berries, making it feel especially appropriate for the transition into fall. Look for it in shady woodland areas rather than out on the open prairie.
• Zexmenia (Wedelia acapulcensis var. hispida)
  Zexmenia is another Texas native that seems completely unbothered by our long summers. Its little golden-yellow flowers keep blooming into fall and fit right in as the Texas landscape starts shifting toward warmer colors.
• Frogfruit (Phyla nodiflora)
  The flowers may be tiny, but don’t overlook this one. Frogfruit can continue blooming throughout our warm September weather and is an important host and nectar plant for butterflies. Consider it one of the tiny supporting characters in all that September pollinator activity.

What to Look for on a September Hike in Texas

I don’t know about you, but by the time August is over, I am so tired of the oppressive heat and being stuck indoors that I am ready to go on a hike. My friend Laurel and I actually have an annual September hike tradition, and you can read about our Hot Springs trip here!

In Texas, September feels like the beginning of hiking season. It may not exactly be sweater weather yet, but the mornings start feeling a little more tolerable, the prairie begins to shift, and suddenly being outside sounds fun again.

And you know me, I can never just go on a hike. I have to turn it into an excuse to be a little botanist and nerd out about plants, wildlife, and whatever else is happening along the trail. Paying attention to those tiny seasonal changes adds so much whimsy to an ordinary walk, but it can also teach you a surprising amount about landscape design.

• Prairie grasses starting to turn golden — Look for those first hints of straw, copper, and rust creeping into all that summer green. It is basically nature testing out its fall color palette.
• Big fluffy grass seedheads — September is when the prairie starts getting texture. Look for seedheads waving above the trail and catching the late-afternoon sun. Landscape designers, take note: movement really does make a planting feel alive.
• Wildflower seedheads — Not everything interesting has to be blooming! Find a dried flower head and see if you can figure out what was growing there earlier this summer. Consider this your reminder that plants can still earn their keep after the flowers are gone.
• Acorns underfoot — Check beneath our native oaks for the beginning of this year’s acorn crop. Bonus points if you can figure out which oak they came from! Also, a good reminder that canopy trees bring a lot more to a landscape than shade.
• Berries and fruits ripening — Look for pops of red, purple, orange, and black tucked among all the green. Fall interest does not always need to come from flowers or leaves.
• Monarchs heading south — September marks the beginning of fall monarch migration through Texas. Keep an eye out for them nectaring before continuing their very long trip to Mexico, and notice which plants they seem to prefer.
• Other migrating butterflies and insects — Monarchs may get all the attention, but they aren’t the only ones taking advantage of September’s late-season nectar buffet. A planting that is buzzing usually has something going right.
• Bird activity changing — Look and listen for birds passing through Texas during fall migration that weren’t hanging around your trail this summer. Pay attention to where they stop for cover, food, or a quick rest.
• Busy spiders — September is a fantastic time to notice big orb-weaver webs stretched between grasses, shrubs, and trees. Try spotting the web before accidentally walking directly through it. 😅 Nature is apparently very committed to overhead detailing.
• Grasshoppers. So. Many. Grasshoppers. — By late summer and early fall, you may notice them jumping out of the grass with practically every step. If the prairie sounds like it is moving, that is probably because it is.
• The first fallen leaves — We are absolutely not at peak fall color yet, but see if you can find the first few yellows and browns collecting along the trail. Even a subtle shift in color can change the whole mood of a space.
• Signs of squirrels getting busy — With acorns and other seeds becoming available, watch for squirrels gathering, eating, and carrying away their fall snacks. Wildlife movement is one more layer of seasonality we do not always think about in designed landscapes.
• A changing prairie soundtrack — Stop for a minute and actually listen. Cicadas, crickets, grasshoppers, birds, and wind moving through drying grasses all make September sound a little different from early summer. Good landscapes are about more than what you see.
• That golden September light — Okay, you can’t exactly check this one off, but notice how different the prairie looks when the lowering sun hits all those seedheads and grasses. If you have ever wondered why designers obsess over backlighting and plant texture, this is why.

September hiking in Texas is less about dramatic fall foliage and more about noticing the prairie slowly shift into a new season. Summer hasn’t completely packed its bags, fall hasn’t fully moved in yet, and somehow you get a little bit of both.

Bonus points if you make your observations with a PSL in hand. You really didn’t think I was going to make it through this section without bringing the latte back, did you?

Texas September Botanical bucket list

Before I bid you farewell until October’s garden to-do list, I want to challenge you to actually get outside and enjoy the season instead of just reading about it from the comfort of your air conditioning!

I’ve put together a little September botanical bucket list to help you do just that. Fair warning, a few of these ideas are a bit North Texas-specific, but feel free to swap in your own local version wherever you live. The exact place may change, but the spirit of the challenge stays the same: get outside, notice what’s changing, and soak up a little bit of September while it lasts.

Spend a September morning at Connemara Meadow and write down everything still blooming. This is definitely one of those more DFW-specific bucket list items, so feel free to swap in a prairie or nature preserve near you. What I love about Connemara Meadow is how accessible it is and how easy it makes it to experience a little slice of the North Texas prairie up close. It’s the perfect place to see those September blooms in action and really notice how the landscape is starting to shift into fall.

Find your first Blue-winged Teal of fall. This is a wonderfully September-specific bird because teal are among the earliest waterfowl to migrate south through North Central Texas. TPWD even has a teal-only season beginning September 19 this year because their migration is so strongly associated with this part of the calendar. Look at shallow wetlands or lake edges rather than neighborhood feeders.

Look for monarch No. 1 of fall migration. I would specifically save this for the last week of September. TPWD says monarchs begin entering the major Texas flyway stretching from Wichita Falls southward during the last days of September. So instead of generic butterfly watching, your challenge is: photograph your first southbound monarch of the season.

Turn your lights out for fall migration. Fall bird migration is really picking up by late September in DFW, and turning off unnecessary lights at night helps reduce the risk of birds becoming disoriented as they travel through the city. If you want to get even more involved, the Dallas Zoo also has volunteer opportunities connected to Lights Out Texas, which is such a cool way to actually help with migration efforts instead of just cheering the birds on from your porch (and you can see Dallas in whole new way!).

Look for the first really rusty-red little bluestem of the season. Who needs dramatic New England fall foliage when little bluestem is out here doing its absolute best to give us a North Texas version of autumn?

Make a “September in Bloom” herbarium page. Photograph or sketch five plants blooming that exact week, then jot down the date and location. If you do this every September, congratulations, you’ll eventually have your own little North Texas phenology record and be dangerously close to becoming the person who says things like, “Hmm, this bloomed earlier last year.”

Take one final sunset prairie walk before the equinox. The autumnal equinox falls on September 22 in 2026, so make it official: take a prairie walk before the 22nd, then go back afterward and see if anything feels different. Will the prairie suddenly put on a sweater? No. Will I still choose to believe fall has officially arrived? Absolutely.

And with that, September is officially ready to make its arrival, bringing cooler temperatures that will surely plummet so dramatically that my pumpkin spice latte will finally need to be hot instead of iced.

Ha. Who am I kidding? We’ll be lucky if it dips into the low 90s.

Still, September is when Texas starts giving us those first tiny hints that fall is on the way. The prairie begins to shift, fall bloomers start showing off, migrating birds and monarchs move through, and suddenly there are little seasonal changes everywhere if you know what to look for.

So this month, I hope you get outside, notice something new, plant something pretty, and maybe knock a few things off that botanical bucket list while you’re at it. I’ll see you back here in October for the next Texas Garden Guide, hopefully with slightly cooler weather and, knowing me, yet another completely unnecessary reference to a pumpkin spice latte. Cheers!