/ 01
The problem
The June glut and the August gap.
Every new flower farmer grows the same first season. A spectacular June, buckets everywhere, and then an August where the only thing blooming reliably is your regret.
It happens because we sow like gardeners. One big joyful sowing in spring, everything at once, and every one of those plants does exactly what it promised: it flowers, together, for three or four glorious weeks. A garden wants a crescendo. A cutting business needs a steady line, because the wedding in September pays the same as the wedding in June, and the market stall needs filling every single Saturday.
Succession planting is the fix, and it is less complicated than the internet makes it sound. It is three separate tools that get lumped under one name: sowing the same flower several times, choosing varieties that relay one after another, and leaning on the crops that keep producing the harder you cut them. Most crops want a combination, and once you see which tool fits which flower, the whole thing stops being mysterious.
A garden wants a crescendo. A cutting patch wants a steady line, week after week, from May to the first frost.
/ 02
The system
The three tools, and which crops want which.
Tool one: sow the same thing again. Tool two: let varieties relay. Tool three: cut harder.
Repeat sowing is for anything that blooms once, gives you a fortnight, and is done. Single-stem sunflowers are the textbook case: one seed is one stem, so a sowing every ten days or so through the summer is literally the only way to have them continuously. Stocks, single-cut too, same logic on a three-week rhythm.
The variety relay is for crops where breeders have already done the succession for you. Early, mid and late varieties of the same flower, sown on the same day, will hand the baton to each other for weeks. Tulips and narcissi work this way, and so do peonies if you plant across the season. You cannot resow a peony, but you can plant six varieties that open in sequence.
Cut-and-come-again is the tool everyone underuses. Cosmos, zinnias, dahlias, sweet peas, scabiosa and snapdragons are all bargaining with you: keep cutting deep, never let a seed head form, and they will keep producing for months. With these, a second sowing still helps, because a June-sown cosmos is a fresh young plant in September when the March-sown one is tired, but the cutting itself is doing most of the succession work. The deeper you cut, the better the stems that come back.
/ 03
The rhythm
How often to resow, crop by crop.
The honest starting intervals, before your own records improve on them. Bands, not laws: heat speeds everything up and a cold spring stretches it.
| Crop | Sow every | Why |
|---|---|---|
| Sunflowers (single-stem) | 7–14 days | One seed, one stem, no second act |
| Stocks | 2–3 weeks | Single cut; relay of sowings is the whole game |
| Ammi and orlaya | 3–4 weeks | A sowing gives a picking window of a few weeks |
| Cosmos | 2 sowings, spring + early summer | Cut-and-come-again; second sowing carries September |
| Zinnias | 2–3 sowings, 3–4 weeks apart | Productive but tires; young plants finish the season |
| Sweet peas | 2 sowings, autumn + late winter | Autumn-sown flower earlier; spring-sown extend the picking |
| Larkspur | 2 sowings, autumn + spring | Hardy annual; autumn sowing is stronger in the UK |
| Cornflowers | Autumn + 2 spring sowings | Fast to flower, fast to finish |
| Snapdragons | 2 sowings, 4 weeks apart | Cut hard and they branch; second sowing insures August |
| Dahlias | Plant once | Succession by cutting, not sowing; deadhead ruthlessly |
Two habits make the intervals actually work. First, sow small and often rather than big and rarely: half a tray every fortnight beats three full trays twice a year, and it is the difference between an August gap and an August wobble. Second, stop sowing in time. In most of the UK a half-hardy annual sown after early July will not repay the compost; the light is going by the time it is ready to perform. Put the last sowing date in the plan with the first.
/ 04
The calendar
A UK sowing calendar to steal.
The plan-on-a-page for a UK cutting patch. Devon dates: if you garden in the north or at altitude, slide everything a fortnight later in spring and earlier in autumn.
| When | Sow or plant | For flowers in |
|---|---|---|
| Late Aug–Sept | Hardy annuals, direct or in modules: cornflower, larkspur, ammi, orlaya, nigella | May–June, the earliest and strongest |
| Oct–Nov | Sweet peas in root trainers; tulips and narcissi in relay varieties | April–June |
| Late Jan–Feb | Sweet peas round two; antirrhinum under cover with heat | June onwards |
| March | Hardy annuals round two; first stocks; ranunculus and anemone corms in mild spots | June–July |
| April | Half-hardies under cover: cosmos, zinnia round one; first sunflower sowing | July |
| May | Direct-sow half-hardies; plant out dahlias after the last frost; sunflowers every 10 days from here | July–August |
| June | Cosmos and zinnia round two; ammi round three; keep the sunflower rhythm | August–September |
| Early July | Last call: fast annuals only, and the final sunflower sowing | September–October |
US growers: the structure survives the crossing, the dates do not. Work backwards from your first and last frost dates, keep the intervals from the table above, and the same relay holds from zone 5 to zone 9. The one big difference is summer heat: in most of the US it is the July resow that saves September, because heat exhausts plants faster than our mild grey summers do.
/ 05
Keeping it going
The hard part is remembering, not knowing.
Nobody fails at succession planting because the theory is hard. They fail because the third sowing of stocks was due the week of a wedding, and nobody wrote it down.
Whatever you use, the plan has to live somewhere outside your head, with dates attached. Our free crop planning spreadsheet has a succession planner sheet built for exactly this: put in a crop, a first sowing date and an interval, and it lays the season's sowings out in front of you. No email address, just take it.
And the feedback loop is the part no calendar can give you. This year's cut records are next year's sowing dates: if the diary shows the June-sown cosmos out-earned the March sowing from September onwards, next year's plan writes itself. That loop, cuts logged in the field turning into next season's plan, is the exact thing BloomOS was built around, and it is why the succession planner and the cut log live in the same place.
From the field
Plan the sowings. Then let the cut log mark your homework.
BloomOS holds your crop plan, your sowing dates and your cut records in one place, so every season teaches the next one. Free to start, built by a flower farmer, and recruiting a small founding cohort now.