Key Facts
- Herbaceous perennial forming a low to medium mound
- Finely divided, aromatic leaves with a pinnate appearance
- Produces yellow, buttonlike composite flowers in summer
- Adapted to sandy, well drained soils and coastal sites
- Attracts bees and other pollinators when in bloom
- Propagates reliably by seed and by division
- Contains compounds that can cause skin irritation or be toxic if ingested
Dune Tansy is a low to medium herbaceous perennial with finely divided aromatic foliage and yellow buttonlike flowers. It performs well on sandy, well drained sites and is valued for pollinator interest and a tidy, mound-forming habit.
Identification
Plants form a low to medium mound with pinnate, finely divided aromatic leaves and compact stems. Summer blooms are yellow, buttonlike composite flowers held above the foliage. Typical mature dimensions are about 12 to 24 inches tall and 12 to 24 inches wide which helps distinguish it from taller, looser tansy relatives.
Where to grow and best uses
Use Dune Tansy in sunny, well drained borders, coastal plantings and sandy rock gardens where a low mound and seasonal yellow blooms are wanted. It attracts bees and other pollinators when in flower and works well as a drought tolerant accent or informal groundcover on poor soils. USDA zones 4 to 9 is an estimated hardiness range.
Planting and timing
Propagate and set out divisions in spring or fall to establish plants with minimal stress. Plants spread to roughly their mature spread so space them about 12 to 24 inches apart to avoid crowding. Seed also propagates reliably but division is the quickest way to establish a uniform stand and retain selected traits.
Watering and soil
Dune Tansy prefers sandy, well drained soils and tolerates low fertility and dry conditions once established. Poor drainage leads to root decline and reduced vigor so avoid heavy clay or waterlogged sites. Moderate supplemental water helps young plants settle in but overwatering produces weak growth and susceptibility to rot.
After flowering and maintenance
Remove spent flowerheads to reduce self-seeding and keep the clump tidy. Rejuvenate congested plants by dividing in spring or fall and discard or relocate older crowns. Light trimming of foliage will refresh appearance but avoid heavy pruning into old wood which can slow recovery.
Propagation and controlling spread
Propagate by seed, division and basal cuttings; seed and division are both reliable. If naturalizing is a concern, remove flowerheads before seeds set and divide plants to control size and renewal. Handle foliage with care because some Tanacetum species contain compounds that can irritate skin and may be toxic if ingested.
Containers and coastal sites
Dune Tansy can grow in containers provided the compost is very free draining and pots have ample drainage. It is associated with coastal habitats and often succeeds on sandy maritime sites but salt spray tolerance and performance in exposed situations can vary by location and should be tested locally.
Frequently asked questions
- How fast does Tanacetum Bipinnatum grow?
- It forms a low to medium mound and typically reaches about 12 to 24 inches tall and wide within a single growing season once established, spreading by seed and division.
- When does it bloom?
- Bloom is in summer, roughly June through August in the Northern Hemisphere, though timing shifts with local climate.
- Is Dune Tansy poisonous?
- Many Tanacetum species contain bioactive compounds. This species can cause skin irritation and may be toxic if eaten so keep away from pets and livestock until species-specific toxicology is confirmed.
- How should I water it?
- Plant in a free draining site and water moderately while establishing. Avoid overwatering because poor drainage causes root decline and reduced vigor.
- How do I propagate it?
- Propagate by seed, by dividing clumps in spring or fall, or by taking basal cuttings to maintain cultivar traits.
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