These estimates for how long Japanese spiraea 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 Japanese spiraea to germinate?
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Days to Transplant How long until I can plant out Japanese spiraea?
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Days to Maturity How long until Japanese spiraea is ready for harvest / bloom?
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Total Growing Days How long does it take to grow Japanese spiraea?