Dahlia Care: From Tuber to Towering Blooms

Dahlias offer unmatched variety—pompons, cactus, dinner-plate, peony-flowered—in every color but blue. Native to Mexico, they grow from tubers planted in spring for summer-to-frost bloom. Staking, pinching, and feeding produce exhibition-quality flowers.

Types (by Flower Form)

• Decorative: Full, flat petals, 4–10 inches
• Cactus/Semi-cactus: Rolled, pointed petals
• Pompon/Ball: Small, spherical, perfect geometry
• Single/Anemone: Open center, pollinator-friendly

Planting

Spring, after frost. Depth: 4–6 inches. Stake at planting (bamboo, metal). Space 18–24 inches. Soil: rich, well-drained, slightly acidic.

Water and Feed

Water deeply 2–3×/week in heat. Mulch to conserve moisture. Feed every 2–3 weeks with low-nitrogen, high-phosphorus/potassium fertilizer. Stop in late summer.

Pinching and Disbudding

Pinch central shoot at 12–18 inches for bushiness. Disbud: remove side buds, leave central for larger flowers. For garden display, leave all buds.

Winter Storage

After frost kills foliage, dig tubers, clean, dry 1 week. Store in peat/vermiculite at 40–50°F (4–10°C). Check monthly for rot.

Pests

Slugs, earwigs, spider mites. Lily beetles on foliage. Good sanitation and targeted controls.