These estimates for how long Helianthus ambiguus takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Days to Germination How long does it take Helianthus ambiguus to germinate?
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Days to Transplant How long until I can plant out Helianthus ambiguus?
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Days to Maturity How long until Helianthus ambiguus is ready for harvest / bloom?
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Total Growing Days How long does it take to grow Helianthus ambiguus?