Genetically tall zinnias (3 feet) cannot be permanently shortened by pruning—they regrow quickly. Options: stake with bamboo in an X-pattern, cut constantly for bouquets, pull them out, or let them flop and move seedlings next year.
Insert thin bamboo stakes at 45° angles along the bed edge, crossing to form a supportive fence. Tie stems loosely.
Next year, transplant volunteers to the back of the border. Choose dwarf varieties for the front.
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