How to Prevent Problems with Dahlias
Snails and slugs are the biggest pest problems for dahlias, and they can be controlled by sprinkling diatomaceous earth or a snail and slug control product likeMiracle-Gro® Nature’s Care® Slug & Snail Controlat the planting site (be sure to follow label directions). Sometimes spider mites can be an issue as well, and neem oil will take care of those. In addition, during hot, humid summers, powdery mildew can coat the plant leaves. There’s not a lot you can do about this beyond making sure to keep leaves as dry as possible when you water the plants and making sure to space them properly when you plant, to allow for ample air flow.
How to Deadhead and Disbud Dahlias
Want more dahlia flowers for a longer period of time? Snip off flowers as soon as they begin to fade. You can also try “disbudding,” which is when you remove some of the extra flower buds from the stems so the plant puts its energy into fewer flowers that will then grow larger. Just pinch off the two buds near the base of the main flower stem when they show up and let the main flower open.
How to Harvest Dahlias
Cut dahlias in the morning, before the heat of day sets in. Use a sharp pair of shears or harvest snips and make sure to choose blooms that are fully open, with no green center visible. (Unlike peonies, dahlia buds won’t open after they’re cut.) To enjoy their beauty longer*, place stems in a vase containing water andMiracle-Gro® for Fresh Cut Flowers—add according to the label directions. Be sure to change the water and add more Miracle-Gro® every 2 to 3 days.
* vs. water only, following label directions
How to Overwinter Dahlias
You can leave dahlias in the garden if you live inzone 8 or higher. In colder areas, though, you’ll need to bring them inside. Here’s how: Wait for a frost, then dig up the dahlia tubers and cut off the stems. Let the tubers sit in a dark, cool place for a few days to dry out, then pack them in between sheets of newspaper. Store them during the winter in a cool, dry spot, such as a closet or insulated garage.
How to Divide Dahlias
If you’ve successfully kept dahlias through the winter, you can divide them in the spring. Simply break apart the clump of tubers, taking care to leave one eye (or stem end) on each piece. Then replant!
*available exclusively from Lowe's
