When it is between marble and golfball size, it’s ready to harvest.
Radishes can reach maturity in as little as four weeks. The time it takes them to develop will depend on light levels, temperatures and the variety you grow. You will see the swollen root just above the surface of the soil. When it is between marble and golfball size, it’s ready to harvest. Radish is a good crop for using little spaces in your garden that might otherwise be bare. This will help to keep your garden productive and protect and enhance your soil.