![]() ![]() ![]() Do not over fertilize, especially with nitrogen, or you risk small or no blooms, weak tubers, or rot. Fertilize every 3 to 4 weeks from sprouting in midsummer until early autumn. After sprouting, dahlias benefit from a low-nitrogen, liquid fertilizer, such as 5-10-10 or 10-20-20.Be prepared to tend to plants before or after rain, when open blooms (especially large ones) tend to fill up with water or take a beating from the wind. When dahlias are established, water 2 or 3 times a week and more in hot, dry climates. Do not water if the soil is damp 1 inch below the surface.Ĭheck out our video to learn more about growing dahlias in your garden:.Spray water on the tuber, if necessary, until growth starts.Cover the tuber with a few inches of soil-crystal mix.Use a soilless mix and co-polymer moisture-retaining crystals, per the package’s guidance.Generally, a 12x12 inch container will suffice. Medium- to dwarf-size dahlias do well in containers that have drainage and are big enough to support the plant at maturity. Dahlias begin blooming about 8 weeks after planting.Place 5- to 6-foot stakes around plants and tie stems to them as the plants grow. Tall, large-flower cultivars require support.Dahlias prefer sun on their roots, plus mulch harbors slugs. Wait until the sprouts have appeared above the soil, then water. Do not water the tubers right after planting.As the stem sprouts, fill in with soil until it is at ground level.Cover the tuber with 2 to 3 inches of soil.Do not break or cut individual dahlia tubers (as you would with potatoes). ![]() Set a tuber into the hole with the growing points, or “eyes,” facing up.It also helps to mix some compost and a handful of bonemeal into the planting hole. To plant the tubers, start by digging a 6- to 8-inch deep hole. Plant the smallest bedding dahlias, grown from seed, 9 to 12 inches apart. ![]()
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