The top flowers you are supposed to deadhead are petunias, roses, and coreopsis. You also need to snip salvia, shasta daisy, and yarrow. Add delphinium, geranium, marigold, and zinnia to the list. Each one rewards your effort with new buds. Iowa State Extension and SDSU Extension both list these as proven rebloomers.
I put petunias and coreopsis side by side in a mixed border two summers ago. I pinched the petunias every other morning and snipped the coreopsis once a week. By July the bed had so many flowers I could not see the soil. The plants I skipped one weekend slowed down right away. The lesson stuck with me for life.
These plants to deadhead share one key trait. They put energy into making seeds once a flower fades. When you remove the spent bloom, the plant shifts that energy back into leaves and new buds. The cycle keeps going for weeks instead of stopping after the first flush. You get a steady show all season long.
The top annuals to deadhead are petunias and marigolds. Zinnias and geraniums make the short list too. These plants live for one season. Their whole job is to make seed before frost. When you cut off the seed source, they keep making more flowers in a try to finish the job. You can get four to five times the bloom count with this trick.
Annual rebloomers
- Plants: Petunia, marigold, zinnia, geranium, cosmos, and snapdragon all push fresh buds within days of a clean cut.
- Rhythm: Pinch every two to three days during peak bloom so seedheads never get a chance to form on the stem.
- Tool: Use your thumb and forefinger for soft stems and small bypass snips for the thicker geranium and snapdragon stalks.
Perennial rebloomers
- Plants: Coreopsis, yarrow, shasta daisy, delphinium, and salvia all bloom again when you cut the spent stalks back to the base.
- Rhythm: Snip these once a week during peak bloom and the plants will give you a clean second flush in three to four weeks.
- Tool: Use bypass pruners for clean cuts that heal fast and do not crush the hollow stems on delphinium and salvia.
Mounding shearers
- Plants: Catmint, hardy geranium, and threadleaf coreopsis form dense mounds that need a shear, not a pinch, to reset growth.
- Rhythm: Shear once in midsummer by taking off about one third of the height once the first bloom flush fades.
- Tool: Use hedge shears for fast work across the whole top of the plant in one quick pass.
The top perennials to deadhead are coreopsis and yarrow. Add shasta daisy, salvia, and delphinium to your list. These plants come back year after year. Cutting them tells the plant to make more flowers now. The plant also stores more food for next spring. When I first tried this with my salvia, I got three full flushes from one plant in a single summer.
Roses sit in their own group. Cut above a five-leaflet leaf that faces outward from the bush. The new cane grows in that direction and gives you a strong stem for the next bloom. Skip the three-leaflet leaves. They make weak stems that bend under the flower weight.
Stick to the rhythm and you will get more blooms than you thought your garden could hold. Pinch your annuals every two to three days. Snip your perennials once a week. Shear your mounding plants once in midsummer. Your neighbors will ask what your secret is by August. You can grin and tell them it was just five minutes a day with a clean pair of snips.
Read the full article: Deadheading Flowers: Complete Garden Guide
