The Dahlia Cactus “Golden Heart” (also known as ‘Mary Poppins’) is a semi-cactus dahlia featuring warm red-orange blooms that radiate into a striking golden center. Growing up to 90-120cm, these vibrant plants thrive in full sun and well-draining soil, providing gorgeous, spiky flowers from mid-summer until the first frost. [1, 2, 3, 4]
Key Growing Details:
- Planting Time: Spring (once soil reaches 15°C / 60°F). [1, 2]
- Planting Depth & Spacing: Plant tubers horizontally about 8-10cm deep with the eye pointing upward, spacing them 15-40cm apart. [1, 2, 3]
- Sun & Soil: Requires full sun (at least 6-8 hours daily). Use well-draining soil rich in organic matter, and add mulch to retain moisture. [1, 2, 3]
- Watering & Feeding: Water deeply (1-2 inches per week). Fertilize every 2-3 weeks with a high-potassium or liquid general fertilizer to boost blooming. [1, 2, 3]
- Winter Care: In cold regions (outside USDA Zones 8-11), dig up the tubers after the first fall frost and store them in a cool, dry, frost-free location over the winter. [1, 2]
