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DAHLIA fertilizers .

Dahlias benefit from a low-nitrogen liquid fertilizer (similar to what you would use for vegetables) such as a 5-10-10 or 10-20-20. You should Fertilize after sprouting and then every 3 to 4 weeks from mid-summer until early Autumn. Do NOT over-fertilize, especially with nitrogen, or you risk small/no blooms, weak tubers, or rot.

I recommend using this one by bulbs direct if you can

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