Gardeners confuse these flowers with Shasta daisies constantly, and it costs them the color show they were hoping for. Painted daisies (Tanacetum coccineum, formerly Pyrethrum roseum) produce crimson, pink, and white blooms on wiry 18 to 30 inch stems, and they contain natural pyrethrins that repel aphids and flea beetles. Learn the soil and sun requirements up front, and you will get five to six weeks of cut-flower-worthy blooms every late spring.
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What They Actually Are
Painted daisy plants are hardy perennials native to the Caucasus Mountains and western Asia. They thrive in USDA hardiness zones 3 through 7, which means they tolerate winter lows down to minus 40 degrees Fahrenheit but struggle in the humid heat of zones 8 and warmer. The pyrethrum compound in the flower heads has been harvested commercially for over a century as a natural insecticide, which explains why deer and rabbits leave them alone.
Mature plants reach 18 to 30 inches tall and 18 inches wide, with fern-like foliage that stays attractive even when the plant is not blooming. Individual flowers are 2 to 3 inches across, with a yellow disc center and ray petals in deep rose, pink, crimson, or pure white.
Planting Site and Soil Requirements
Full sun is non-negotiable. These perennials need at least 6 hours of direct sunlight daily to produce abundant blooms and hold their stems upright. In partial shade they flop, stretch, and bloom sparsely.
Soil drainage matters more than soil fertility. Heavy clay kills them within a single winter because the crowns rot in soggy conditions. If your native soil sticks to a shovel, amend the planting bed with 3 to 4 inches of compost mixed 50/50 with coarse sand to a depth of 10 inches.
- Soil pH: 6.0 to 7.5 (slightly acidic to neutral)
- Drainage: Excellent, never waterlogged
- Spacing: 18 inches between plants
- Planting depth: Crown exactly at soil level, never buried
When and How to Plant
Plant nursery-grown pyrethrum daisies in spring after the last frost, or in early fall at least six weeks before your first hard freeze. Spring planting gives the strongest root establishment but may sacrifice first-year blooms. Fall planting often delivers a fuller flower display the following May.
Dig the hole twice as wide as the root ball and the same depth. Water the plant thoroughly in its pot an hour before transplanting to reduce root shock. Backfill with native soil mixed with a handful of bone meal, water in with a half-gallon per plant, and mulch lightly with 1 inch of shredded bark. Keep the mulch 2 inches away from the crown to prevent rot.
Starting From Seed
Seed packets from reputable suppliers like Johnny’s or Swallowtail run $3.50 to $5.00 and contain enough for 50 plants. Start indoors 8 to 10 weeks before your last frost date in seed trays with a standard soilless mix. Germination takes 14 to 21 days at 65 to 70 degrees Fahrenheit. Transplant to 4 inch pots when seedlings have four true leaves, then harden off and plant outside after the last frost.
Watering and Feeding
Established plants are mildly drought-tolerant but bloom best with consistent moisture. Water deeply once a week during dry stretches, applying 1 inch of water per session rather than frequent shallow sprinklings. Drip irrigation is preferred because wet foliage invites powdery mildew in humid conditions.
Fertility needs are modest. A single spring application of balanced granular fertilizer like 10-10-10 at 1 pound per 100 square feet is plenty. Overfertilizing pushes floppy foliage growth at the expense of flowers. Skip summer feeding entirely.
Pruning and Deadheading for Rebloom
Deadhead spent flowers individually by cutting stems back to the nearest leaf node. This single practice can add two to three weeks of continuous bloom. When the main flush finishes in mid-June, shear the entire plant back to 6 inches tall. You will often get a lighter second flush in late August or early September.
Divide clumps every three to four years in early spring to maintain vigor. Plants that have been in place longer than that start to bloom sparsely and develop dead centers. Lift the clump, cut it into 4 to 6 inch sections with a sharp spade, and replant the outer, youngest pieces.
Common Problems and Solutions
These are tough plants but not indestructible. The three issues you will likely encounter:
- Crown rot: Caused by poor drainage or buried crowns. Solution is replanting at proper depth in amended soil
- Aphids: Ironic given the pyrethrum content, but young shoots attract them. A strong water spray knocks them off
- Powdery mildew: Appears on leaves in late summer. Improve air circulation by thinning neighboring plants and water at soil level only
- Floppy stems: Usually a sun or fertility issue. Move to brighter spot or reduce feeding
Using Them in the Landscape
The flowering stems hold up for 7 to 10 days in a vase, which makes these plants a cut-flower favorite. Pair them in the border with catmint, salvia, hardy geraniums, and shasta daisies for a long season of color. The fine-textured foliage contrasts beautifully with hostas and daylilies.
Because the plants contain natural pyrethrins, gardeners have long interplanted them among vegetables to deter pests. The effect is subtle but real. A single row bordering the vegetable garden reduces aphid pressure on nearby lettuce and kale.
Cost and Sourcing
Quart-sized perennial pots from local nurseries run $8 to $14 depending on variety. Named cultivars like ‘Robinson’s Red,’ ‘James Kelway,’ and ‘Brenda’ offer larger flowers and stronger stems than generic seed-grown plants. Mail-order suppliers like Bluestone Perennials and Digging Dog Nursery ship bare-root divisions in early spring for $12 to $18 each with a three-plant minimum. Buy named varieties if you want reliable color and habit, because seed-grown strains vary significantly.
