I never plant them, I feed birds in the winter Black Oil Sunflower Seeds, and the ones the birds miss, come up. 2nd time this has happened, and one right now is over 7 feet tall with tons of blooms.
Last year I had about 100 plants before the fool spousal unit mowed them down, you would think since the grass was 1 inch and the plants were at that time 3 feet tall???? Moron.
But the birds really enjoyed them and it was great watching them climb the stalks to eat the seeds.
Horses make me a better person.