Keep on picking! Many berry plants, vegetables, and annuals respond by making more blossoms and fruits when you keep up with the harvest.
Remove seed heads from perennials and annuals if you don’t want self-seeding proliferation. If you want to keep them, many perennial seeds are great food for birds and pollinators.
This is a good time to start perennials from softwood cuttings. Use the healthiest branches available. Plants that are easily multiplied by softwood cuttings include lavateras (Lavatera spp. and cvs., Zones 7–10), rosemary (an herb but treated as a perennial), bee balms (Monarda spp. and cvs., Zones 4–9), penstemons (Penstemon spp. and cvs., Zones 4–9), and tall sedums (Sedum spp. and cvs., Zones 3–11). And while redtwig dogwoods (Cornus sericea, Zones 3–8) are considered shrubs, they propagate nicely when you take cuttings, grow them out, and replant them where needed.
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