Blue Horizon Pink Dahlia Bulbs

Pink at the base, blue at the tip. The transition is soft enough that from three feet away the flower simply looks iridescent — the way a petrol spill looks like one color until it doesn’t. The effect is strongest in cool light and in the first two days after opening; a bloom left on the plant for a week evens out toward mauve.

What you get

• Graded tubers with a visible eye, packed in peat.
• Blooms 5–6 in, fully double, with a gold center that shows at full open.
• Plants 30–36 in tall with stems that hold the flower upright in rain.

An honest note

Two-tone dahlias are the ones buyers are most often disappointed by, because the blue reads stronger in photographs than in dull weather. In full sun this one does what the photos show. In a grey week it will look like a mauve-pink dahlia, and that’s still a good flower.

Planting

• Wait for warm soil. Plant two weeks after your last frost date, once the soil holds 60°F / 15°C at 4 in deep. Cold soil rots tubers before they wake.
• Set them 4–6 in deep, eye facing up, with 2–3 in of soil over the crown. Space 15–18 in apart so air moves between plants.
• Water once at planting, then hold off until shoots break the surface — a soaking wet tuber with no roots has nowhere to put the water.
• Full sun, 6+ hours. Stake at planting if you want straight stems; adding supports later breaks roots.

Season & hardiness

• Blooms 8–10 weeks after planting and keeps going until the first hard frost.
• Hardy in USDA zones 8–11. In zones 3–7 lift the tubers after frost blackens the foliage, or grow as an annual.
• Pinch the center shoot at about 12 in to double the stem count; more stems, smaller blooms.
• Deadhead spent flowers every few days. Left to seed, the plant stops producing new buds.