Radishes grow very quickly so they are a very good candidate for plant growing time lapses. Times of Nature brings us a 38 days time lapse from planting seed to harvesting.
In another time-lapse from Boxlapse we have an even faster growth – in 20 days using a grow light Mars Hydro TS 1000 full spectrum LED.
While they are very fast to grow, one of the common issues with radishes grown in containers is that they don’t grow bulbs. There are multiple reasons why radishes might not develop bulbs and mistakes can be made especially when we are talking about containers.
One of the reasons might be over fertilizing with nitrogen that produces bolting (the green leaves are overgrowing). Other reasons are keeping the soil either too dry and/or too wet for an extended period. Plating them too close together might also prevent bulb growing and maybe being too hot.
Late Boomer explains few of the reasons:
Brian also explains why radishes may fail to produce bulbs
Gary Pilarchik from The Rusted Garden brings us some good tips for Growing Radishes not Leaves: Fertilizing, Planting, Spacing, Thinning, Soil & Maturity. Basically no fertilizing, offering enough spacing 1-2 inches apart.
The good news is that even if you don’t manage to grow bulbs, radish greens are actually edible and there are some great recipes out there like radish pesto, radish top soup or chimichurri sauce