Answer: To promote additional bloom, cut the entire flowering stem off the plant. You may have to stake the taller varieties of snapdragons to keep them upright. Pull off any yellowing leaves and new leaves will grow. If you do not see insects on the foliage, it's hard to know what they are and how to control them. Since only a few leaves have holes in them, I don't think the insects will do much harm to the plants.
Enjoy your snapdragons!
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