Over-fertilization can be much more detrimental than under-fertilization. For the best results, plant climbing hydrangeas in well-draining, slightly acidic soil. petiolaris) should have overlong shoots cut back immediately after flowering. "Fertilizer burn" can occur when too much fertilizer is applied, resulting in a drying out of the roots and damage or even death of the hydrangea.It is much, much better to err on the side of too little fertilizer than too much. Get involved. For perennial vines that reach impressive heights, choose climbing hydrangeas. If you add the fertilizer after August, your plants will become too soft to survive the winter. The faded blooms of hydrangeas are attractive in the winter months. You may see your plants begin to wilt and burn like they would after receiving too much sun. Ideally, leave them on the plant over winter as on some types this protects the plant from frost damage. The Royal Horticultural Society is the UK’s leading gardening charity. This will encourage better blooms. Give them sun—and shade. Most flowers appear towards the top of the plant, so try to leave as much of this un-pruned as possible; Established plants will tolerate hard pruning in spring, but extensive cutting back all in one go is likely to reduce flowering for the next couple of summers. Like the hydrangea shrub, the climbing hydrangea produces clusters of flowers in the spring and sporadically during the growing season. Everything you need to know about choosing the right climbing hydrangea for you. Soil and Transplanting. Climbing types are pruned in summer after flowering. Others are pruning in spring or late autumn. Choose your hydrangea keeping both the height and spread of the mature plant in mind. You should fertilize again after blooming during the summer. Adding too much fertilizer can damage hydrangeas. Hydrangeas can be tiny or huge! Find the best location. Discover climbing hydrangeas. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Discover climbing hydrangeas. Join the RHS today and get 12 months for the price of 9. The climbing Hydrangea is a woody, ... Plants should be fed in early spring with a high phosphorous granular fertilizer. The climbing hydrangea (Hydrangea anomala subsp. Dwarf varieties like ‘Paraplu’ are perfect for containers, while large ‘Kyushu’ hydrangeas are better for your landscape. Even though it could help you get some nice blooms during the season, it isn’t worth it for the next growing season. (Use less fertilizer for hydrangeas in a container.) 3. The climbing hydrangea is appropriate for planting in USDA zones 4 through 7. The climbing hydrangea (Hydrangea anomala petiolaris) is a clinging vine that grows up to 50 feet and is related to the popular hydrangea shrub.