posted 1 year ago
Hi there from western MA (5b).
I grow Japanese purple mustard and mine have self sewn for the last 3 years. For the self seeding aspect, I think cutting back weeds and cover crop at the right time is essential for the seeds to come back on their own. For me, this means once the ground ivy has reached maturity and is is well into flower, I cut back or pull anything that is carpeting the soil. The mustards that come up in spring will usually bolt and will have resewn seed in time for fall harvest, which again, self seeds the next spring's crop. The Japanese purple mustards will get greener and elongate throughout the years. (Assuming that they are reverting to a parent gene) I grow mustards in sun and shade and the only difference is the mature size is smaller in shade.
For kale, I grow red Russian and have a similar experience as I do with mustard. The difference being, the kale will not seed until the late fall and are harvestable all summer. (Even in July and August with 90°f sun)
For collard greens, I don't have problems with bolting the year of planting. They do good through our cold winters and will go to seed by late spring the following year. I will let the seeds fall to see how they self sew later this year or next spring.
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Seed slanging, dirt sniffer