When Endless Summer bigleaf hydrangea ( Hydrangea macrophylla " Bailmer " ) burst onto the scene in the early 2000s , it was the first hydrangea of its sort to bloom onboth old woodand new stems from the current year . Before that prison term , similar hydrangeas bloomed only in spring on stem that withstood wintertime . For nurseryman in northern climates , a cold rough wintertime could wipe out a whole year ’s blossoms . With Endless Summer and its Endless Summer Collection fellow , gardener relish blooms from later spring to accrue . All Endless Summer Collection hydrangeas thrive with the same basic care .
Light and Water
right sunlight and moisture encourage abundant , healthy Endless Summer flush . In most climates , the plants need full sunrise sunlight and filtered afternoon tone . In northern garden with weaker rays , six hours of dayspring sun rewards with more blossoms . In southerly climates , bound morning Sunday to two hr and protect the plant from harsh sun with good afternoon nicety . Endless Summer favour moist , well - drain soil . Too much water diminishes blooms . In hot climates , the plants may droop , but they bounce back quickly . Water well and let the filth dry to the touch before watering again . Water the dirt straight , and avoid wet Endless Summer foliage .
Soil and Fertilizer
Fertile soil , high in organic topic , fuels this hydrangea ’s endless heyday . modal garden grime benefits from constitutional compost to improve soil structure and aeration , while contribute aristocratical nutrients . Prior to planting , layer 2 to 6 inches of organic compost over the planting bed and contain it 6 to 8 inches deep . Endless Summer ’s sound reblooming nature justify a single nutritionary boost in former summertime . habituate a mealy , obtuse - release plant food with a higher middle phone number . Avoid high nitrogen ; it inhibits heyday . Work about 1/2 cup of 15 - 30 - 15 plant food into the soil around each established plant ; read the recording label on your plant food for specific instructions . Water well before and after you fertilize , and keep fertilizer 6 in from the stems . Wear protective clothing , including glove and condom eyewear , whenever you work with chemical substance .
Pruning and Protection
Endless Summer ’s heaviest blossoming fall out betimes in the time of year , on the anterior year ’s growth . Pruning and wintertime protection combine to protect those one-time - forest bloom buds from wintertime cold . All Endless Summer Collection variety are hardy in U.S. Department of Agriculture plant hardiness zones 4 through 9 . In cold climates , hack your hydrangeas back to 12 to 15 in tall after downfall ’s first toilsome freezing . Then traverse the plants with a thick layer of leaves , pale yellow or mulch . polish off it once frost threats pass in spring . In fond climates , keep trim to a minimum . When plants show bud in spring , prune off any dead pourboire or damage woodwind instrument . habituate discriminating bypass pruners for crisp cuts , and unsex the blades with household disinfectant before and after each chaparral .
Pests and Disease
Endless Summer hydrangeas have few problems with pests or disease . If aphids take up residence on tender young growth , a quick urine - hosiery flack ship them packing . In hamper quarters or humid climates , fungous diseases may crawl in . Remove affected leaves , and scavenge the area thoroughly of debris . deflect overhead lachrymation to reduce disease transmission . If you chose to treat with fungicide , a quick - to - use , chlorothalonil - base ware aid . Spray foliage and stems thoroughly at the first sign of disease . Avoid getting the fungicide on blooms ; it can cause discolouration . Repeat every seven to 14 days , as needed . Wear protective clothing , as with all chemicals .
Flower Color
Endless Summer blooming color reckon on aluminum in your soil and soil pH. In acidic ground with aluminum present tense , blooms are course blue . In dirt that lack aluminum or have alkaline pH , Endless Summer blooms are pink . Beautiful purple heyday come down in between . Change your rosiness people of colour by manipulating grime pH and aluminum . For deterrent example , watering with a mixture of 1 tablespoon of Al sulphate in 1 congius of water monthly , for three months in spring , lowers soil pH , increase aluminum and enhance aristocratical blooms . Always get a professional dirt trial before adjusting grease extensively . If your dirt has abundant aluminum , add more can leave stain toxic to plant .
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