Why won t my hydrangea bloom

If you have a hydrangea that won’t flower, you may have pruned it back too far the year before. Often, hydrangeas that aren’t producing flowers have been pruned in early summer and late winter.

The primary reasons hydrangeas don’t bloom are incorrect pruning, bud damage due to winter and/or early spring weather, location and too much fertilizer. Hydrangea varieties can be of the type that blooms on old wood, new wood or both. Old wood is the current year’s growth and new wood is next year’s (spring) growth.

Impact of Coffee Grounds

Coffee grounds turn soil more acidic, helping hydrangea blossoms turn blue rather than the typical pink or white. The acidity of the grounds provides the key element, though aluminum sulfate or eggshells also produce the same effect.

Some gardeners report success in turning their hydrangeas blue by applying coffee grounds to the soil. The coffee grounds make the soil more acidic, allowing the hydrangea to more easily absorb aluminum.

Whether you have the big leaf, smooth leaf, or panicle type of hydrangea, you will see one spectacular bloom per year. As much as you may wish it, hydrangea reblooming does not occur on the standard varieties of the species.

All-purpose Miracle-Gro fertilizer is well suited for hydrangeas. Mix the Miracle-Gro fertilizer with water according to package instructions for the size of your hydrangea shrubs. Apply the Miracle-Gro fertilizer every other time you water, about every two to three weeks.

If you’re looking to harness the benefits of coffee grounds related to improving the quality of the soil, you can use them in composted form 2-3 times a year. If you want to alter the pH of the soil, you may need to use them more often, scattering them over the soil of your hydrangea.

Baking soda is one of the recognised ways to change the color of hydrangeas. … It will alter the pH level in the soil and therefore change the bloom color. White hydrangeas are primarily grown in a neutral soil and to keep them that way, you must transplant them into a soil similar to what your plant has been grown in.

Hydrangeas like morning sun, but do not do well if they’re in direct, hot afternoon sun. Partial shade in the later parts of the day is ideal for these beauties.

There are a few main reasons that you may not see blooms on your hydrangea bushes: sun exposure, over-watering and over-fertilizing. Endless Summer^® hydrangeas prefer morning sun and afternoon dappled shade. … Also, over-watering and over-fertilizing your plants can inhibit bloom production.

A pH of 7 is neutral, and household vinegar has a pH of around 2.4 (which is quite acidic). The theory is, applying diluted vinegar to the soil will lower the pH enough to change the color of your hydrangea blooms. … Plus, for your hydrangeas to change colors, they need a pH change sustained over a long time.

You should deadhead throughout the blooming season to keep your hydrangeas looking their beast and encourage new flower growth. However, stop deadheading hydrangea shrubs in mid to late fall, leaving any spent blooms in place.

Leaf Symptoms

Overwatering hydrangeas impacts leaf growth in a range of ways. Root rot caused by overwatering produces yellowed leaves rather than dark, rich green leaves. An overwatered plant may shed leaves prematurely, or there may appear to be an overgrowth of green foliage due to stunted flower growth.

Trimming should be done immediately after flowering stops in summer, but no later than August 1. Do not prune in fall, winter, or spring or you could be cutting off new buds. Tip-pruning the branches as leaves emerge in spring can encourage multiple, smaller flower heads rather than fewer larger flower heads.

Pruning New-Wood Bloomers

You can take a more relaxed attitude about pruning if you have hydrangeas that set flower buds on current season wood, like panicle and smooth hydrangeas. … Even if you cut canes back to ground level during dormancy, the shrubs will grow back and produce blooms in spring.

In late winter or early spring, these shrubs can be cut all the way back to the ground. Smooth hydrangeas will produce much larger blooms if pruned hard like this each year, but many gardeners opt for smaller blooms on sturdier stems.

Remember buds for blooms are produced on old wood and the more old wood you remove the less floral display in the spring and summer. To rejuvenate the hydrangea, remove up to 1/3 of the older living stems down to the ground each summer.

Wait until Spring to prune hydrangeas

While some plants bloom on new growth, others primarily set flower buds on old wood. Regardless, it is best to wait to prune all hydrangeas until spring. In the fall, hydrangeas (and all trees and shrubs) are in the process of going dormant.

A good way to start winterizing hydrangeas is to lay down a thick layer of mulch over their root area. Straw works well for this. For even greater protection, cover the shrub with a wire cage, or build a cage around it with strong stakes and chicken wire. Wrap burlap or insulation cloth around the cage.