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?

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