You set out to grow cut-and-come-again lettuce through August and ended up with a glut in June and bare beds by mid-July, because you didn't stagger the sowings and the one piece of paper with your sowing calendar got damp in the polytunnel and is now unreadable.
The Timing Problem That Ruins Kitchen Gardens
Succession sowing is not complicated in principle — you sow a small batch every two weeks instead of everything at once, and you get a continuous harvest. In practice, it requires knowing the usable sowing window for each crop, holding that information somewhere accessible, and actually acting on it at the right two-week interval. Most allotment gardeners carry this in their heads for two or three crops they know well, and spectacularly mismanage everything else.
The failure mode is consistent: a gardener direct-sows a full packet of French beans in late April, gets 40 plants ready simultaneously in July, gives half to the neighbours, and then has nothing for August. Meanwhile, the calabrese they started indoors in March went into the ground at the wrong spacing — 20cm apart instead of 45cm between rows — and produced undersized heads because they were competing for nutrients and light the entire season.
Getting spacing wrong for brassicas is a particularly unforgiving mistake. It cannot be corrected at the time of harvest.
What a Per-Crop Record Solves
The structure of this template is a crop-by-crop reference database, not a diary. Each record is a single vegetable, and it holds all the planning information you need for that crop in one retrievable place.
The sow date window — Start and End fields — defines the permissible sowing period for that crop in your conditions. Flagging this against the Succession Sowing field — N/A, Weekly, 2 Weekly, 1st Sowing, 2nd Sowing — tells you immediately how to pace your sowings within that window. A courgette record with Succession Sowing: N/A and a sow window of March 15 to April 30 means you sow once and you're done. A radish record with Succession Sowing: Weekly and a window of March through September means you should be putting in a short row every seven days from the moment the soil warms.
The spacing fields — Between Plants and Between Rows, both integers in centimeters — are the numbers you actually need at the moment of planting, when you're kneeling in the bed with a tape measure. They are not reference-book knowledge; they are operational inputs that are wrong surprisingly often when recalled from memory. Parsnips sown at 10cm spacing produce finger-sized roots. The same parsnips at 30cm, well-thinned, give you roots worth washing. The database record is consulted, not remembered.
The Variety Shortlist and the Problem Records
The five Variety fields create a curated shortlist for each crop. For a first-year allotment gardener, having 'Kelvedon Wonder' as a noted pea variety alongside 'Feltham First' removes the paralysis of standing in front of a seed rack with forty options and no basis for choosing. For an experienced grower, the fields hold the varieties that actually performed — the ones they've trialed and kept. 'Monarca' blight-resistant tomatoes in Variety 1 and 'Sungold' in Variety 2 means those are the only two slots this grower fills every year, and everything else is experiments that go in a notes field.
The Potential Problems field is where the experienced grower encodes the painful lessons. Club root in the brassica record. Carrot fly in the parsnip record. Slugs during establishment in the salad beds. These aren't decorative annotations — they're the reminders that determine whether you set beer traps on sowing day or wait until you see the damage. That half-sentence of specific, gritty institutional knowledge, written into a record once, prevents the same mistake across every season.
The multiple Advice fields — for sowing, spacing, and care — are where technique lives. "Sow direct, thin to strongest seedling, water in well" takes thirty seconds to type once and is available forever when you're standing in the plot on a Sunday morning trying to remember whether parsley needs cold stratification to germinate.