Plant These In September! 9 Perennials That Come Back Bigger Every Year

Most gardeners think the planting season is over. The summer flowers are fading, the garden centers are quieting down, and everyone is packing their tools away until spring. And that is exactly why their gardens look average next year. Because here is what the best gardeners know and almost nobody talks about. September is not the end of the planting season. For perennials it is the single best planting month of the entire year. Right now the soil is still warm from summer which means roots grow fast. The air is cooling down which means no heat stress on young plants. The autumn rain is on its way to do your watering for you. And the garden centers are slashing prices on exactly the plants I'm about to show you. A perennial planted this month spends the whole autumn quietly building roots underground, sleeps through winter, and then explodes out of the ground next spring. Bigger and stronger than anything you plant next year. So today I am giving you nine perennials to plant in September. Nine plants that come back bigger every single year, that practically look after themselves, and that will make next spring feel like a magic trick you set up months in advance. And stick with me because number eight is the one that makes people stop on the pavement and ask what it is and it might be the easiest plant on this entire list. Let's get into it. Number one. Hostas. If you have a shady spot in your garden that you genuinely have no idea what to do with, this plant is about to make you very happy. Hostas are grown for their foliage and those leaves are stunning. Huge bold architectural leaves in deep green, blue green, golden chartreuse, and beautiful variegated combinations of white and green. Some varieties stay small at six inches across. Others spread to four feet wide and become the centerpiece of an entire bed. They thrive in shade, the exact spots where most other plants give up. Once established, they are surprisingly drought tolerant. They come back bigger and more impressive every single year and they are almost completely hands-off once they are in the ground. And September is a brilliant time to plant them because the warm soil gets the roots established fast and you will often find them marked down at the garden center just as the planting window opens. They are hardy in zones three through nine which covers almost everyone. If you have a problem shady corner, Hostas fix it. Full stop. Number two. Coneflower. Also known as Echinacea and if you have never grown it, you are missing out. These tall daisy-like flowers come in purple, pink, white, orange, and yellow and they are among the most popular perennials in the world for good reason. They handle heat. They handle drought. They grow in poor soil. They attract pollinators constantly through their long blooming season. Plant them this month and the roots settle in through autumn, ready to push up strong flowering stems next summer. And here is the bonus. In autumn and winter, if you leave the seed heads standing instead of cutting them back, songbirds feed on those seeds for months so your garden stays alive and Deadhead them for more blooms or leave them completely alone and let nature handle it. Either way, your garden looks intentional. Coneflowers are hardy in zones three through nine and shrug off both cold winters and hot summers. Number three. Daylilies. The workhorse. The classic. The plant that has been in gardens for generations and earns that reputation every single year. The variety is staggering. There are over 80,000 registered daylily cultivars. Hot oranges, soft creamy yellows, rich burgundies, delicate pinks, deep reds. And they are aggressively easy to grow. Full sun or part shade, clay soil, sandy soil, slopes, flatbeds, containers. Daylilies simply do not care. They grow in dense clumps that naturally crowd out weeds. They spread slowly and every few years you can divide them and get more plants for free. In fact, September is exactly when established clumps should be divided. So if you or a neighbor already grow them, this month you can multiply them for nothing. One honest note. Daylilies are toxic to cats so if you have outdoor cats, plant them with a little awareness. They are hardy in zones three through nine. One of the most widely adapted perennials you can buy. Number four. Satum, also called stone crop, and specifically the upright variety called autumn joy. This is the plant I would bet you cannot kill. Satums are succulents. They store water in their thick fleshy leaves which makes them virtually drought-proof. Rocky soil? Fine. Full blazing sun all day? Perfect. Forget to water for a month? Satum genuinely does not care. And right now in September, autumn joy is at the peak of its show. It opens pale pink in late summer, deepens to rich rose, and then turns a warm rust bronze that holds its structure well into winter. You can see exactly what you were buying at the garden center this month. Plant it the same afternoon and it will come back bigger every year for a decade. For every difficult hot dry sunny spot in your garden, this is the answer. Satum is hardy in and some creeping varieties survive zone two winters. Number five. Catmint. If you want continuous season-long color with almost no work whatsoever, this is your plant. Catmint forms soft billowing mounds covered in clouds of small lavender blue flowers. It blooms heavily in late spring and if you shear it back by about a third after that first flush, it blooms all over again in late summer. It has that relaxed cottage garden quality that makes a space look effortlessly designed. It handles sun, it handles partial shade, it grows in poor soil, it is drought tolerant once established, and it never has to be fed. Planted now, it establishes through autumn and gives you that full flowering performance in its very first spring, not its second. It is perfect for edging paths and softening hard borders. Fair warning, cats may roll in it enthusiastically. That is not a problem you need to solve. It is hardy in zones three through eight and extremely cold tolerant, a gift for northern gardeners. Number six. Astilbe. This one is for the shade lovers and it is one of the most underrated perennials on this entire list. Under mature trees in a north-facing bed in the spots that never see much direct sun, most flowering plants struggle. Astilbe thrives. It produces feathery, plume-like flower stalks that look like fireworks frozen in slow motion. Pinks, reds, whites, purples. Plant a few different varieties and you get months of color in places your neighbors assume nothing can bloom. Now, Astilbe is the one plant on this list that does consistent moisture and that is exactly why autumn planting suits it so well. You put it in this month and the September and October rain keeps it perfectly watered while the roots settle with no hose duty from you at all. It is hardy in zones three through eight and it is spectacular in cooler, damper regions. In warmer zones, give it afternoon shade and it will reward you for years. Number seven. Creeping Phlox. This one delivers more visual drama for less effort than almost any plant I know and September planting is precisely how you set the trick up. In spring, Creeping Phlox produces a hot pink, genta, purple, white that the foliage disappears completely underneath them. It cascades over rocks, tumbles down retaining walls, and flood slopes with color in a way that looks like you spent serious money and serious time. Here is the thing though, the plants you see performing like that every April were planted the previous autumn. Put Creeping Phlox in now, let it root quietly through the cool months, and next spring your garden produces that magazine cover moment in its very first year. After flowering, it becomes a neat evergreen mat that holds soil on slopes and crowds out weeds. The entire maintenance job is one light trim after it blooms. It is hardy in zones three through nine. Number eight. Russian Sage. Here it is, the one I told you to wait for and the one I wish someone had pointed me to years earlier. Russian Sage is not a true sage, and it is not from Russia, but it is one of the most stunning, most architectural, most effortlessly elegant plants you can put in the ground. From midsummer through fall, it sends up tall, airy, silver white stems covered in thousands of tiny lavender blue flowers that seem to float and shimmer. The whole plant has a misty, cloud-like quality. It moves in the breeze, it catches the light, and it makes everything planted near it look more expensive. And the care requirements are almost laughable. It wants full sun, poor soil, and neglect. It genuinely performs better in lean soil than rich soil. It is extremely drought tolerant, deer resistant, windproof, and heatproof. Do not feed it, do not fuss over it, and it gives you three to four months of breathtaking color every year. Plant it in early September while the soil is warm, and it will be established before winter, and ready to put on its full show next summer. This is the plant that makes people stop at your fence and ask what it is. And the honest answer is, the easiest plant in the garden. It is hardy in zones four through nine. In cold regions, cut it back to about six inches in late autumn, and it returns reliably every spring. Number nine, ornamental grass, and specifically Carl Forster feather reed grass. I saved this one for last on purpose because I want it to be the one you walk away remembering. Carl Forster grows four to six feet tall in a neat, upright clump that does not flop, does not sprawl, and does not spread where you do not want it. In late spring, it sends up feathery plumes that catch the light. By mid-summer, the plumes turn warm gold. By autumn, the whole plant glows bronze in the low light, and in winter, it stands. It holds its structure through cold, through snow, through wind, swaying and catching the light when everything else in the garden has died back to nothing. Most perennials give you a few weeks of bloom and then become background. This is a genuine four-season plant. It is drought tolerant, it never needs staking, it never needs feeding, and the entire annual maintenance task is one hard cut back in late winter, down to about six inches before the new growth appears. One haircut per year. That is the whole deal. Plant it this month, and by next summer, you have height, movement, texture, and even sound, because grass moving in the wind is one of the most calming sounds a garden can make. It is hardy in zones four through nine. So there they are, nine perennials, one September, and a completely different garden next year. Let's put it together by where you need them. For the shady spots, hostas, and astilbe. For the hot, dry, sunny spots, sedum, russian sage, and coneflower. For edges, slopes, and ground cover, catmint, and creeping phlox. For the backbone of the whole design, daylilies and Carl Forster grass. And remember why this month matters. Warm soil, cool air, free watering from the autumn rain, and end of season prices. The gardeners with the gardens you envy in May are the ones quietly planting in September. You do not need a green thumb, and you do not need free weekends. Pick three plants from this list. Just three. Get them in the ground this month, and next spring, when they come up bigger than anything your neighbors planted, you will know exactly why. Now tell me in the comments which three you are picking, because I read every single one and it shapes the videos I make next. And if this changed how you think about autumn, hit that subscribe button, because here at bloom proof this is exactly what we do. We take the plants everyone struggles with and show you they were only ever misunderstood. And before you go, watch our 12 lazy perennials for pots. Popping up on screen right now because it pairs perfectly with everything you just learned. Until next time, get out there, get your hands dirty, and grow something that lasts.