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when to pinch leggy dahlias started indoors

I started my dahlias indoors in pots about 3 weeks ago. They are growing like gangbusters and some are already 8 inches tall. But: they are too leggy. I used the same full morning sun window last year to start them, and didn't have this problem. Some have a good 3 inches between leaf pairs. I was planning to pinch them as I would rather have them bushy than tall. I know I didn't pinch them this early last year; I think I did it after they were outside hardening off.

Should I go ahead and pinch now above the 3rd leaf pair? Since they are so stretched out I'm thinking the stems may be too weak to support a bushy top above that.

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