Knol Khol Purple Seeds (Kohlrabi)Kohlrabi is a hardy biennial grown as an annual. Kohlrabi has a swollen globe shaped stem that makes it look like a turnip growing on a cabbage root. Stems can be white, purple, or green and is topped with a rosette of long stemmed blue green leaves. Kohlrabi is milder and sweeter than either cabbage or turnip. Knol khol is a cool season crop. It can withstand extreme cold or frost. A soil with rich in minerals produces large knobs(tubers). It grows