Phacelia is a wonderful cover crop and the bees are nuts on it. Letting it go to seed, well, I haven't replanted it in the original garden spot since I sowed that seed. I have ripped out thousands and thousands of plants to keep a decent level so that they grow better, with about a foot between each plant, hundreds and thousands more will germinate, not to mention all the new places on my property where I have sown the seed this year.
I gathered about 10 pounds of seeds last year from my phacelia, that was alot of dried flower heads, winnowed to get the seed separated from the chaff. I had to use a fan to blow that chaff and let the seeds fall below into a garbage can. Just a part of my life. Beautiful and most wonderful day, loving and grooving on life. Cindi