When is the best time to transplant roses? It is best to transplant existing planted roses in February or March while they are dormant. Container grown roses can be planted at any time, but March through May is the best. Where should roses be planted? Roses must receive at least six or more hours of direct sunlight each day. The soil must be well drained, so no tight clay and no standing water. They must have good air circulation, so plant them a minimum of three feet away fr