Dormant tubers can be planted in mid-April (warm zones) or early May (northern zones). Tubers can vary greatly in size, so dig a hole deep enough so that the crown (eye) of the tuber rests about 3 inches below the surface after planting.
Dormant tubers can be planted in mid-April (warm zones) or early May (northern zones). Tubers can vary greatly in size, so dig a hole deep enough so that the crown (eye) of the tuber rests about 3 inches below the surface after planting.
After the foliage on your dahlias turns brown and dies back (about 2 weeks after a killing frost), cut the dead stems to about 6 inches and use a spade or fork to gently lift out the tubers. Rinse off excess soil and remove any broken or damaged roots. Lay the tubers out to dry on several sheets of newspaper for a day or two. After the tubers are dry, place them in boxes in between layers of peat moss or finely shredded leaves.
Store them in a cool, dark (frost-free) place. Each year your dahlias will continue to produce additional tubers. These can be divided to increase your stock or shared with others. Use a sharp knife to divide the tubers, keeping in mind that each tuber needs to have an "eye" in order to grow a new plant.
https://www.gardeningknowhow.com/ornamental/bulbs/dahlia/tips-dahlia-planting.htm
