Q- Help! There seems to be something wrong with my radish. Why the stem is so long? I had the same problem, in the outside garden last summer. Ended up with huge leaves and no radishI’m growing them on a seed starter shelf, with one 24W 6400K light, 12hr direct light/day, 70F whole day. Standard commercial seedling starter mix. Not enough, too much, wrong light?
A - Radishes are very fast to grow and are a cool weather crop, so keeping the heat up has made them really take off, a bit like leaving heat mats under seedlings
Which should never be done, it makes them go leggy even when the light is really good. Light in fact isn't that critical for radishes, as they can actually grow in shady spots under other veg. I'd tend to move the pot to somewhere cooler, like a windowsill and where you can get some good air flow, or place a fan indirectly on lowest setting, as movement makes stems thicken up and get stronger
Radishes don't really need to be babied like most seedlings, so if these fail just plant another lot, and start them straight off as above. If you're going to grow them all the way to harvest indoors, (around 4 weeks from sowing for many) you need to pick a pot deep enough, to accommodate the root. Like most root veg they shouldn't be transplanted. Good luck
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