Do not plant these flowers in August — unless you enjoy buying seed twice. Here is what fails at this time of year, why, and the four flowers that are actually easier to plant now than in spring.
Every August, thousands of people finally get around to the garden bed they meant to plant in May. They buy zinnia seed. They scatter it. They wait.
And in most of the country, nothing blooms before the frost takes it.
Here is the arithmetic nobody puts on the packet. Warm-season annuals — zinnias, cosmos, marigolds, sunflowers — are frost-tender and need roughly 75 to 95 days of genuine warmth between sowing and first flower. Count forward from today. If your first frost lands before that window closes, those seeds produce foliage, then die. You have not grown a garden; you have composted a bag of seed, and you will be buying more in spring.
That is the mistake. It is completely avoidable, and the fix is not to give up on planting this month.
Because there is a second group of flowers — a group most gardeners never think about in August — where sowing now is not a compromise. It is the correct time. Better than spring, and easier.
The seed was fine. The calendar was the problem. What most August failures actually come down to
All four are frost-tender warm-season annuals. Sown now, they will not reach bloom before frost across most of the US.
None of this means the seed is bad. It means the calendar is wrong — and buying warm-season seed in August is only a mistake if you sow it in August.
Buy it now at the sale price, store it somewhere cool and dry, and sow it after your last frost next spring. Heirloom seed holds viability for years. You get spring’s planting at August’s price.
Now for the part almost nobody takes advantage of.
Cold-hardy annuals, biennials and perennials. For all four, autumn sowing is the traditional method — not a fallback.
Spring sowing means waiting on soil that is cold, wet and heavy. Half the failures people blame on seed are really seed sitting in cold mud, rotting before it can germinate.
August soil is warm all the way down and drains properly. Cold-hardy seed sown into it germinates fast, then does its establishing while conditions are still generous.
The feelingNot standing over a bed in April wondering whether it is dry enough yet.
The most tedious part of spring sowing is keeping a seedbed evenly moist through weeks of unpredictable weather. Miss a few days at the wrong moment and the germination is gone.
Sow now and the season takes over. Cooling temperatures cut evaporation, autumn rain arrives on its own schedule, and the establishing period runs largely without you.
The feelingA planting that does not depend on you remembering.
I scattered hollyhock and poppy in late August, watered it in once, and then honestly forgot about it. Came back out in March and there were established plants sitting there waiting. I did nothing all winter.
Several of these varieties germinate better after a spell of cold — which is why seed packets sometimes tell you to chill seed in the fridge before spring sowing.
Sow in autumn and you can skip that entirely. The seed overwinters in the ground and gets the cold period naturally, exactly as it would if the parent plant had dropped it there.
The feelingSkipping a stage of gardening you did not enjoy anyway.
This is the payoff, and it is the reason experienced growers sow in autumn deliberately.
A plant that established last autumn already has a root system when spring arrives. It comes away immediately instead of starting from a seed in cold ground — which typically means flowering several weeks ahead of anything sown in spring, and a bigger plant when it does.
The feelingColour in the bed while everyone else is still waiting on sprouts.
The poppies I sowed last fall were flowering three weeks before the ones I started in spring, and the plants were nearly twice the size. I am not going back to spring sowing.
Seed pricing runs on the spring rush. Demand peaks in March and April, and so does what you pay.
Right now the whole catalogue is discounted — which means the varieties you sow this month and the warm-season seed you store for spring both come in at the same reduced price. Buying in August and sowing across two seasons is simply the cheaper way to run a garden.
The feelingNot paying the April premium like everybody else.
The deeper reason people spend so much every year is that most garden centre stock is hybrid — bred so its seed will not grow true. Collect it, sow it, and you get something weaker or nothing at all. So you go back.
Every variety here is open-pollinated heirloom. Leave a few heads to dry at the end of the season, collect the seed, and next year’s planting costs nothing. The hollyhocks and poppies self-seed readily on their own if you would rather do nothing at all.
The feelingDriving past the garden centre in April with nothing to buy.
This is why ordering this month works. What is on offer right now is built around exactly this split.
The hollyhocks and the California poppy go into the ground now — this is their correct window. The zinnias and nasturtium store over winter and go in after your last frost. One purchase at the August price, planted across two seasons, and a bed that has both spring structure and summer colour.
The feelingBeing a season ahead instead of a season behind.
Fall sowing is the only way I plant poppies now. Earlier, stronger, and I skip the whole spring scramble.— Karen M., Oregon
I assumed August meant I had missed the whole year. Turns out it was the right month for half of what I wanted to grow.— Tanya B., Missouri
Hollyhock and poppy have gone in the ground in autumn at my place for fifteen years. That is simply how they are meant to be sown.— Bill H., Pennsylvania
Heirloom Non-GMO · USA Sourced · Seed Count Printed on Every Bag · Free Shipping Over $49.99
Get the Cottage Garden →| Sown in August | Sown Next Spring | |
|---|---|---|
| Hollyhock | Correct window — blooms next summer | Often loses a full year |
| California Poppy | Traditional timing, strongest results | Workable, but weaker |
| Bachelor’s Button | Overwinters, earlier and stronger | Fine, but later |
| Zinnia | Will not reach bloom before frost | Correct window |
| Cosmos | Will not reach bloom before frost | Correct window |
| Watering effort | Autumn rain does most of it | Weeks of hand watering |
| Seed price | August sale pricing | Spring peak pricing |
Only if you sow it now. Buying it now is the sensible move — it is discounted, and heirloom seed stored somewhere cool and dry stays viable for years. Put the zinnia and nasturtium packets in a drawer, sow them after your last frost, and you have bought spring’s garden at August’s price. The mistake is the sowing date, not the purchase.
Possibly — if your first frost is still 75 to 95 days out, you have the window these need. Check your average first frost date and count backwards; if it covers the window, go ahead. If not, store the seed. The whole point of this page is that the answer depends on your frost date, not the calendar month.
That is what they are built for. Hollyhock is a biennial and California poppy and bachelor’s button are cold-hardy — overwintering as a small plant is their normal life cycle, not a risk you are taking. In very cold climates a light mulch after the ground firms up helps, but no protection is needed across most of the country.
Honest answer: not this year, for the autumn-sown varieties. The poppy and bachelor’s button flower in spring, and hollyhock — being a biennial — flowers the following summer. What you buy by sowing now is an earlier, stronger, bigger display than a spring sowing produces, not instant colour. If you want flowers within weeks, this is the wrong month and no seed will change that.
Seed pricing follows the spring rush, so August is genuinely the low point in the year. Beyond that, these are heirloom and open-pollinated — collect seed at the end of the season and the second year costs nothing at all. The saving compounds rather than being a one-off discount.
They need 75–95 frost-free days to bloom and are killed by frost. For most of the country, that window has closed by August.
Hollyhock, California poppy, bachelor’s button and rockcress — all prefer autumn sowing.
Search your city plus “average first frost date”. Count back 75–95 days to see whether warm-season sowing still fits.
No. All are direct sow — scatter, cover lightly, water in.
Lightly. Most need barely covering; poppy in particular wants surface contact and light.
Water in at sowing. After that autumn and winter rainfall handles it in most regions.
In cold climates a light mulch once the ground firms helps. Do not smother young seedlings.
Poppy and bachelor’s button in spring. Hollyhock, being biennial, the following summer.
Cool, dark and dry — a paper envelope in a drawer is enough. Viable for years.
Yes — all heirloom and open-pollinated. Hollyhock and poppy self-seed readily.
60-Day Bloom Guarantee — contact us for a full refund.
The mistake is not planting in August. It is planting the wrong things in August, then concluding that seed does not work.
Put the hollyhock and the poppy in the ground this week. Put the zinnia in a drawer until spring. Next year you get both — and you paid August prices for the whole thing.
Get the Cottage Garden →This is a paid advertisement for Homegrown Garden. Sowing windows vary by climate, soil and season — check your local first frost date.
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