Companion Planting forum: Sunflower Allelopathy

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Wyoming (Zone 4a)
Apr 16, 2018 8:38 AM CST
I've heard that sunflowers prevent germination and stunt the growth of seedlings around them, but aren't harmful to mature plants. Would this affect tubers or bulbs? If not, could I use wild sunflower to exclude weeds from a bed of say sunchokes and walking onions?When interplanting with sunflowers for living trellis, should I transplant them after the companions are established, or transplant mature conpanions around them?
Michigan (Zone 5b)
Keeper of Poultry
Jun 13, 2018 10:48 AM CST
I think they are commenting on the effects of a bird feeder with lots and lots of sunflower seed hulls being dumped on a small area. In my experience, its not just the seed hulls but also the concentration of bird poop and scratching that causes the plants around that area to be stunted.

I have grown sunflowers in my veggie garden without any trouble. I would grow them in the back of corn rows so the deer would nibble on the sunflowers instead of the corn. Even with deer eating them, the sunflowers would still grow big and strong once started. No negative effects with other plants that I know of.

Either way, the sunflowers will not keep weeds from growing in your planting bed. Sorry to say, it won't help.

good luck

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