By the time August rolls around, my geraniums have usually told me exactly how the summer has gone. If we’ve had good soaking rains, they’re plump and cheerful. If the heat has been fierce and the wind has had its way with the porch pots, they look a little tired around the edges, much like the rest of us. But I’ve grown geraniums long enough to know that August is not the time to coast. It’s the month that decides whether those plants will keep throwing bright red, coral, salmon, and pink blooms right up to first frost, or whether they’ll fizzle out before the county fair pies are even judged.
Over the years here in the Midwest, I’ve learned that a few timely chores in late summer make all the difference. Geraniums are sturdy, old-fashioned plants, but they do appreciate attention when days are still hot, nights begin to shift, and every bit of energy matters. These are the August jobs I never skip if I want full plants, sturdy stems, and blossoms that keep my porch and garden beds glowing well into autumn.
1. Deadhead every faded flower head before it can sap the plant’s strength
This is the first thing I do in August, and I do it often. A spent geranium bloom doesn’t just look shabby; it keeps the plant focused on making seed instead of making fresh flowers. I walk through my pots and beds every 2 to 3 days with a small bucket in hand and remove every faded bloom cluster I see.
Don’t just pluck off the dry petals. Follow the flower stalk all the way down to where it meets the main stem, then snap or snip it cleanly at the base. On zonal geraniums, that stalk is usually 3 to 6 inches long, and removing the whole thing makes the plant look neater immediately. If a pot has 10 or 12 spent heads, clearing them all at once can trigger a surprisingly fast flush of new buds within 7 to 10 days, especially if the plant is otherwise healthy.
2. Cut away yellow leaves, brown edges, and any mushy growth right now
August heat can make lower leaves yellow, especially on container geraniums that have gone through a stretch of irregular watering. I remove every yellow leaf, every brown crispy leaf, and any stem that feels soft or blackened. Leaving tired foliage in place traps moisture, reduces airflow, and gives disease a foothold.
When I tidy a plant, I’m looking closely at the crown and the inside of the plant, not just the outer pretty parts. If you see leaves with round brown spots, or foliage that looks water-soaked and limp, get that material off the plant and out of the area. I don’t compost diseased geranium debris. I bag it and toss it. It sounds fussy, but in a humid August, this one habit can keep a whole grouping of porch pots from going downhill.
3. Water deeply, but stop the daily little sips
Geraniums do not want to sit in soggy soil, and they also don’t like the stress of drying out completely day after day. In August, I aim for deep watering instead of frequent shallow watering. For a 10- to 12-inch pot, that often means watering until moisture runs from the drainage holes, then waiting until the top 1 inch of soil feels dry before watering again.
In my part of the country, that might mean every day during a 92-degree heat spell with wind, or every 2 to 4 days during milder weather. Beds are a little different. Established geraniums in the ground usually do well with about 1 inch of water per week, but if temperatures stay above 90 degrees for several days, I’ll add an extra soaking. Morning is best. Watering between 6 a.m. and 9 a.m. gives leaves time to dry and roots time to drink before the worst heat arrives.
4. Feed for flowers, not just leaves
By August, many geraniums have used up much of the fertilizer available in their pots, especially if they’ve been watered heavily all summer. This is when I give them a light but steady feeding to support continued bloom. A water-soluble fertilizer such as 10-15-10 or 15-30-15, mixed at half strength every 10 to 14 days, works well for potted plants.
I’m careful not to overdo nitrogen. Too much nitrogen gives you lush green leaves and fewer blooms, and in August that’s not the bargain we want. If you prefer a slow-release fertilizer, scratch in a modest amount according to the label, but remember that container plants often need more regular support because nutrients leach out with each watering. A pale plant with small blooms and slow growth is often telling you it’s hungry.
5. Move pots to catch morning sun and a little afternoon relief
Geraniums bloom best with at least 6 hours of sun, but August sun can be harsh, especially on patios, driveways, and south-facing porches where heat bounces off concrete or brick. If your pots are getting blasted from noon to 5 p.m. and flowers are shrinking or leaves are scorching, shift them to a spot with full morning sun and light shade in the hottest part of the day.
I’ve had years when simply moving a few pots 6 feet from the west side of the porch to the east side changed everything. The plants perked up, the bloom color stayed richer, and I spent less time rescuing them from afternoon wilt. In-ground geraniums are harder to move, of course, but you can still help them by making sure nearby annuals or overgrown herbs aren’t crowding out airflow.
6. Pinch leggy stems to wake up fresh branching
By late summer, geraniums can get a bit long in the chin, as my mother used to say. If stems are stretched, bare at the bottom, or leaning awkwardly, pinch or cut them back by 1 to 3 inches just above a leaf node. This encourages the plant to branch and produce fuller top growth instead of one tired stem with a lonely bloom on the end.
On a badly leggy plant, I’ll sometimes reduce a few stems by as much as one-third, but I don’t scalp the whole plant at once in August unless it is truly miserable. A moderate grooming is safer this late in the season. Within a week or two, you’ll usually see fresh side shoots forming, and those side shoots are what carry the next round of buds.
7. Check for budworms, aphids, whiteflies, and spider mites before they get ahead of you
Geraniums are tough, but pests can move in quickly during hot, dry weather. In August I inspect both sides of the leaves, the flower buds, and the stem joints at least twice a week. Budworms are especially discouraging because they chew the flower buds before they open. You may notice tiny holes in buds or petals that look ragged before they even unfurl.
Aphids cluster on tender growth. Whiteflies flutter up in a little cloud when you brush the plant. Spider mites often show up as fine stippling or pale speckling on leaves, and sometimes delicate webbing. If I catch pests early, I usually start with a firm spray of water in the morning, followed by insecticidal soap according to label directions. Thorough coverage matters more than force. Miss the undersides of the leaves, and you’ve missed half the problem.
8. Loosen the top of the soil and refresh tired containers
Container soil compacts over time, especially after months of watering. When that happens, water may run down the sides of the pot instead of soaking in evenly. In August, I gently loosen the top 1 inch of soil with my fingers or a small hand fork, being careful not to damage roots near the surface.
If the pot has settled badly, I’ll top it off with 1 to 2 inches of fresh potting mix, leaving at least 1 inch of space below the rim so water doesn’t spill over. This little refresh improves moisture absorption and gives the plant a modest nutrient boost. If roots are circling hard at the drainage holes and the plant dries out by noon every day, it may be rootbound. At that point, moving up just 1 pot size, say from 10 inches to 12 inches, can buy you several more weeks of strong bloom.
9. Keep mulch light and tidy around in-ground plants
For geraniums in garden beds, mulch helps hold moisture and moderate soil temperature, but too much piled against the stems invites trouble. I use a light layer, usually 1 to 2 inches of clean straw, shredded leaves, or fine bark, and I keep it pulled back about 2 inches from the base of each plant.
That gap matters. It improves airflow around the crown and reduces the chances of stem rot in muggy weather. In August, I also check whether mulch has crusted over or matted down after storms. If it has, I fluff it lightly so water can pass through instead of running off. It’s a small task, but one that keeps the root zone more even during weather swings.
10. Stop seed production on fancy and ivy types too, not just the common red ones
Many folks are faithful about deadheading the classic zonal geraniums but forget the ivy geraniums and newer varieties in hanging baskets and mixed planters. Those need the same August discipline. Ivy geraniums, especially, can hide spent blooms beneath trailing growth, so I lift the vines gently and check underneath.
Seed production takes energy no matter the variety. If you let even a few flower heads mature, the plant begins to shift its priorities. On mixed planters, I also trim back neighboring petunias, bacopa, or sweet potato vine if they’re swallowing the geranium. A plant can’t bloom brightly if it’s being smothered by its roommates.
11. Protect blooms from late-summer storm damage
August weather in the Midwest can turn on a dime. One afternoon it’s still and hot, and by supper you’ve got pounding rain and wind whipping across the yard. Before a storm, I move lightweight pots closer to the house, under an eave if possible, or cluster them where they can brace one another without crowding too tightly.
After a storm passes, I don’t wait days to clean up. Broken stems, torn leaves, and soaked spent blooms should be removed within 24 hours if you can manage it. Wet debris turns sour fast. If a container’s drainage saucer is full, empty it. Geranium roots left standing in water for even half a day in warm weather can sulk for a long while after.
12. Take a few cuttings now as insurance for next year
This won’t keep this year’s flowers blooming directly, but it is one of my favorite August geranium chores because it saves the best plants. If you have a variety that has bloomed beautifully all summer, take cuttings now while stems are still vigorous. Choose non-flowering shoots 4 to 5 inches long, cut just below a node, remove the lower leaves, and let the cut end dry for an hour or two.
Then tuck the cuttings into a small pot of barely moist potting mix or a half-and-half blend of potting mix and perlite. Keep them in bright, indirect light and water sparingly until roots form, usually in 2 to 4 weeks. I’ve carried favorite salmon and rosy-red geraniums through many winters this way. It feels a little like saving a family story.
13. Make a simple August care schedule and stick to it
Geraniums respond best to steady care, not heroic rescue. In August, I keep a simple routine: deadhead on Monday and Thursday, inspect for pests midweek, fertilize every other Saturday, and water according to the weather. It sounds almost too plain to mention, but regular attention prevents 90 percent of late-summer problems.
If you have several pots, write the fertilizer date on a little stake or on masking tape under the container rim. By this point in the season, it’s easy to forget what was fed, when, and how much. A little order keeps you from underfeeding the weak ones or overfeeding the strong ones.
14. Watch the nighttime temperatures as frost season begins to inch closer
First frost may still feel far away in August, but the slow seasonal turn begins now. As nights start dropping into the low 50s, many geraniums actually color up nicely and bloom with fresh energy, provided they’ve been cared for through the heat. That’s why these August tasks matter so much. You’re helping the plant bridge the hardest part of summer so it can enjoy the kinder days that often come in September.
Once your forecast starts hinting at nights below 40 degrees later on, you can prepare to move treasured pots indoors or cover them temporarily. But for now, August is your window. Clean them up, feed them right, water them deeply, and keep them free of pests. Geraniums are generous plants. Give them this bit of timely care, and they’ll return the favor in cheerful color right up until frost silvers the edges of the yard.