1 Your age: POAG becomes much more common as we get older. It is uncommon below the age of 40 but this type of glaucoma affects one per cent of people aged over 40. About five per cent of people over the age of 65 have primary open angle glaucoma.  Your race: if you are of African origin you are more at risk of POAG.
Harvest. Cabbage will be ready for harvest in 80 to 180 days from seed depending on the variety or in 60 to 105 days from transplants. Cut cabbage when heads are firm and the base of the head is 4 to 10 inches across.
When to Plant Cabbage. In spring, start seeds indoors or in a cold frame eight to 10 weeks before your last spring frost, and set out hardened-off seedlings when they are about 6 weeks old. Seeds germinate best at 65 to 75 degrees Fahrenheit.n summer, start seeds 12 to 14 weeks before your first fall frost, and transplant the seedlings to the garden when they are 4 to 6 weeks old. Plant early and late varieties to stretch your harvest season.