GrowingHQ

Growing calendar

What can be sown, planted and harvested in each month, worked out from the catalogue and resolved for United Kingdom (general).

Whose calendar this is

Every window in GrowingHQ is stored relative to a climate event — six weeks before your last frost, once the soil has warmed — and resolved into months for a named region. These pages are resolved for United Kingdom (general). A middling UK average. Used as the default when a reader has not said where they are, and deliberately cautious: acting a fortnight late costs a little, acting a fortnight early can cost the whole sowing.

A growing season anchored to the last frostA timeline running from ten weeks before the last spring frost to twenty-four weeks after it. Sowing indoors happens eight to two weeks before the last frost. Transplanting into larger pots happens three weeks before to the frost date itself. Planting out happens one to four weeks after the last frost. Harvest runs from ten to twenty-two weeks after. The last frost date is marked as a vertical line, and a note explains that this date falls at different times across Britain, which is why GrowingHQ stores timing relative to the frost and derives the months for each region rather than publishing one national calendar.Last frost-8-40+4+8+12+16+20weeks relative to the last spring frostSow indoors-8 to -2Transplant-3 to 0Plant out+1 to +4Harvest+10 to +22
The last frost falls weeks apart across Britain, so GrowingHQ stores the window relative to it and derives the months per region. That is why you get a window rather than a date.
January0 to sow outdoors · 1 under cover · 17 to harvestFebruary1 to sow outdoors · 15 under cover · 17 to harvestMarch15 to sow outdoors · 26 under cover · 15 to harvestApril29 to sow outdoors · 20 under cover · 18 to harvestMay31 to sow outdoors · 5 under cover · 29 to harvestJune22 to sow outdoors · 1 under cover · 52 to harvestJuly21 to sow outdoors · 0 under cover · 72 to harvestAugust15 to sow outdoors · 0 under cover · 76 to harvestSeptember10 to sow outdoors · 1 under cover · 77 to harvestOctober2 to sow outdoors · 1 under cover · 67 to harvestNovember1 to sow outdoors · 0 under cover · 32 to harvestDecember0 to sow outdoors · 0 under cover · 18 to harvest