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To have bushier-shaped zinnia plants, pinch off an inch or so from the tips of the main stems while plants are still young. Regularly deadhead or remove old flowers to keep plants attractive and encourage more blooms. If taller zinnia varieties begin to flop, stake with y-shaped branches or metal hoop staking around the plants. A second application of a 5-10-5 fertilizer in mid season will help to keep zinnia plants growing strongly.