Planted garden hydrangeas need winter protection
Garden hydrangeas are not endangered by freezing temperatures. The shoots can freeze back, but keep sprouting in spring. This is the same with many trees that bloom in midsummer, so the frozen parts are simply cut back courageously in spring. The problem with garden hydrangeas, however, is the fact that the shrubs create their flower buds in late summer for the coming year. If these wintering buds are damaged by frost, the flowering will fail in the following summer. This is especially true for the garden or farmer's hydrangeas, but also for the Japanese plateHydrangeas (Hydrangea serrata). In exposed, windy locations is especially in winter sun good winter protection is extremely important.
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Hibernate garden hydrangeas in a bucket frost-free
The wintering of garden hydrangeas in the tub is problematic because the root ball freezes through very quickly, even with larger planters. It is therefore better to overwinter the plants in a sheltered place, if necessary also in the garage. Otherwise, garden hydrangeas can be outdoors in the tub from early spring to autumn. They can withstand a few short-term freezing temperatures without suffering any damage. But do not expose them to the cold for a long time. The problem with tub plants in general is that the root ball freezes through much faster than in the bed. Therefore, the plants have to overwinter in a frost-free, but cool and bright place.
Put tub hydrangeas into winter quarters from October
From October the Garden hydrangea be brought to the winter quarters depending on the temperature profile. It is important that the shoots have set strong buds before overwintering, from which the flowers then develop in spring. Water now and then even in winter quarters, because the earth must never dry out completely. Before moving into winter quarters, you can Cut back withered shoots a little, repotting is now also possible. In any case, potted hydrangeas should be repotted about every one to two years.
Tips & Tricks
In preparation for the hibernation, you should stop using any fertilizer from around mid-August. At this point the garden hydrangea stops growing and instead forms the buds for the next year. Further fertilization would prevent sufficient bud maturity.