🌱 Microgreens
A windowsill tray crop, ready in a week — your very first harvest.
Microgreens at a glance
Is Microgreens frost tolerant?
Here it is grown as a windowsill pot, so frost is not part of the picture. Keep it somewhere that stays between 15 and 28°C.
What temperature does Microgreens grow best in?
It grows best between 15 and 28°C. Below 8°C it stops growing altogether, and above 32°C it slows down.
How many days does Microgreens take to mature?
About 6–8 days. That is a typical figure: it needs roughly 75 °C·d of warmth above 8°C, so a warm season gets it there sooner and a cool one later. The city calendars below give the sow and harvest dates for each place.
What the numbers mean
These are the actual parameters this game runs on. Growth is driven by growing degree days: each day contributes max(0, min(mean temp, 30) − 8), and Microgreens is ready when that total reaches 75. That is why the same seed takes a very different number of days in Dublin and in Guangzhou.
| Base temperature | 8°CBelow this, the plant accumulates no growing degree days at all. |
|---|---|
| Degree days to maturity | 75 °C·dThe heat budget it must accumulate before it is ready to pick. |
| Comfortable range | 15–28°CWhere it grows without stress. |
| Frost damage below | -20°CLeaves start taking frost damage below this low. |
| Killed below | -30°CBelow this it does not come back. |
| Heat stress above | 32°CAbove this the plant slows down and stops setting fruit well. |
| Typical time to harvest | 6–8 days |
| Yield per bed | 4 handfuls |
Things worth knowing
- Microgreens grow on the seed's own reserves — they barely need any soil fertility.
- Sprouting is the most metabolically active moment of a plant's life, packing several times the vitamins of the grown plant.
Where and when to sow Microgreens
Pick your city to see the months when Microgreens scores well against that city's real climate records: