Deadheading, or the practice of removing spent flowers, is often promoted as a way to keep gardens neat and encourage new blooms.
While this works wonderfully for annuals like zinnias or geraniums, some plants benefit more when you leave their fading flowers, seed pods, or hips intact.
For these plants, deadheading can actually reduce their impact – removing seeds that could self-sow, cutting off food for birds and pollinators, or eliminating striking seed heads that give your garden four-season beauty.
Here are 15 flowers you shouldn’t deadhead – and why resisting the urge to snip those spent blooms can make your garden healthier, wilder, and more beautiful year after year.
1. Coneflowers (Echinacea)
Coneflowers are one of the most iconic perennials in cottage gardens. Their daisy-like petals fade into large, spiky seed heads that persist into fall and winter.
- Why not to deadhead: Those seed heads are beloved by goldfinches and chickadees. They also add striking structure when capped with frost or snow.
- Bloom cycle: Summer through fall. Plants may rebloom lightly if deadheaded early, but leaving the last flush to set seed is best.
- Wildlife value: Provides both food (seeds) and shelter for birds.
- When to prune: Cut back in early spring before new growth emerges.
2. Black-Eyed Susans (Rudbeckia)
These cheerful yellow flowers light up borders from midsummer into fall.
- Why not to deadhead: Their dark, cone-shaped centers are seed buffets for birds, particularly finches.
- Bloom cycle: July–September.
- Wildlife value: Seeds feed birds, while the flowers attract bees and butterflies.
- When to prune: Allow stalks to remain through winter, then trim back in early spring.
3. Sunflowers (Helianthus)
Sunflowers are summer icons that continue to give long after their petals fade.
- Why not to deadhead: Their seed heads are valuable food for birds, squirrels, and even overwintering insects.
- Bloom cycle: Mid to late summer, depending on variety.
- Wildlife value: Nectar for pollinators while in bloom; protein-packed seeds for birds in fall.
- When to prune: Leave standing until winter storms knock them down, then compost the stalks or leave them for wildlife shelter.
4. Ornamental Grasses
Though technically not flowers, ornamental grasses produce seed plumes that shine in the garden.
- Why not to deadhead: Their airy plumes add height, texture, and winter motion. Birds use the seed heads for food and shelter.
- Bloom cycle: Late summer into fall.
- Wildlife value: Seeds and cover for overwintering species.
- When to prune: Cut back hard in late winter or early spring before new shoots appear.
5. Sedum (Stonecrop, especially Autumn Joy)
Sedum produces clusters of starry blooms that turn bronze as they fade.
- Why not to deadhead: The dried flower heads look like sculptures, especially dusted with frost.
- Bloom cycle: Late summer through fall.
- Wildlife value: Nectar for late pollinators; seed heads provide structure.
- When to prune: Remove old stems in spring as new green shoots emerge from the base.
6. Globe Thistle (Echinops)
Known for their striking, spiny blue blooms, globe thistles remain impressive even as seed heads.
- Why not to deadhead: Their globe-like seed heads provide architectural winter interest and food for birds.
- Bloom cycle: Mid to late summer.
- Wildlife value: Attracts bees and butterflies during bloom, and birds later.
- When to prune: In spring, cut stalks down to the ground to make way for new growth.
7. Alliums (Ornamental Onions)
Alliums are beloved for their bold, spherical blooms.
- Why not to deadhead: Even after flowering, their dried seed heads resemble bursts of fireworks, making them highly ornamental.
- Bloom cycle: Late spring into early summer.
- Wildlife value: Pollinators adore their nectar; dried heads provide garden texture.
- When to prune: If reseeding is a problem, clip seed heads after they fade; otherwise, leave for ornament.
8. Clematis (Certain Varieties)
Some clematis, like C. tangutica, form whimsical, feathery seed heads.
- Why not to deadhead: Their silky tufts extend ornamental appeal long after flowering.
- Bloom cycle: Depends on variety – spring or summer bloomers.
- Wildlife value: Pollinator-friendly flowers; seed heads add ornamental value.
- When to prune: Follow specific clematis pruning group guidelines; don’t remove seed heads prematurely.
9. Milkweed (Asclepias)
A keystone plant for monarch butterflies, milkweed’s life cycle is tied to its pods.
- Why not to deadhead: The seed pods burst open to release silky parachutes that spread new plants. Deadheading prevents reseeding.
- Bloom cycle: Summer.
- Wildlife value: Host plant for monarch caterpillars and nectar for pollinators. Seeds provide natural propagation.
- When to prune: Remove only after seeds disperse in fall.
10. Columbine (Aquilegia)
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