How long does it take hydrangeas to grow full size?

Asked By: Nastaca Pawelowski | Last Updated: 6th February, 2020
Category: home and garden landscaping
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Hydrangeas are classified as rapid growers, or 25 or more inches per year until the plant reaches maturity. A "tree" format plant will become at least 3 inches wide at a point 4 1/4 feet high and grow at least 13 feet high.

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Just so, how do you make my hydrangeas grow faster?

How to Get More Smooth Hydrangea Flowers:

  1. Plant smooth hydrangeas in full sun if the soil stays moist.
  2. Water them during times of drought, especially during the heat of summer.
  3. Amend the soil with organic matter (such as compost).
  4. Prune stems back in early spring, just before new growth emerges.

Likewise, how big will a hydrangea get? As its name implies, the panicle hydrangea (Hydrangea paniculata) features long panicles of white, densely-packed flowers. This is the largest of the shrub species and can reach a maximum average height and width of 15 and 12 feet respectively. It has been known to reach heights of 25 feet.

Simply so, do hydrangeas get bigger every year?

Most new growth hydrangeas put on buds in early summer to bloom in the following spring, summer and early fall seasons. In hot climates, hydrangeas may stop blooming in the heat of summer, but will rebloom in the fall.

Are hydrangeas difficult to grow?

Hydrangeas are versatile and easy to grow. They are not at all particular about where they're planted. All they need is well-drained soil, some water and a little bit of shade during hot summer days. Find out even more about hydrangea care in our Complete Hydrangea Guide!

38 Related Question Answers Found

What happens if you don't prune hydrangeas?

Hydrangeas that bloom on old wood do not need pruning and are better off for it. If you leave them alone, they'll bloom more profusely the next season. But go ahead and gently thin or deadhead. Just remember new growth may come, but that new growth will be without blooms next season.

Can I use Miracle Grow on hydrangeas?

Gardeners who want robust and healthy hydrangeas must focus on providing enough sunshine and water for their plants. Hydrangeas also require fertilization to thrive; however, they don't require special fertilization. All-purpose Miracle-Gro fertilizer is well suited for hydrangeas.

Are coffee grounds good for hydrangea?

If you're growing hydrangeas, use coffee grounds to affect their color. Coffee grounds add extra acidity to the soil around hydrangeas. On a chemical level, this increased acidity makes it easier for the plant to absorb naturally occurring aluminum in the dirt. The effect is pretty blue clusters of flowers.

Are Epsom salts good for hydrangeas?

Hydrangea macrophylla, ones with pink and blue ones, are affected by the pH of the soil. A pH below 6 is best for blue flowers; above 6 encourages pink ones. Adding Epsom salts to your plant increases the amount of magnesium in the soil.

How often should I water hydrangeas outside?


The hydrangea should be watered thoroughly at least 3 times a week. Always water the plant all the way around the container, not just in one place. Water should come out the bottom of the pot. Never let it sit in water which will cause the roots to rot away.

Should you cut back Endless Summer hydrangeas in the fall?

Endless Summer Hydrangeas should not be pruned in the fall. Instead, prune them only in May. This will ensure the flower buds that have made it through the winter have emerged. Prune out only dead wood and leave any green buds or leaves.

What is the best fertilizer for hydrangeas?

Fertilizing: Hydrangeas do especially well when fertilizers are effectively used in spring or early summer. We recommend using a granular, slow-release fertilizer with a high percentage of phosphorus (the middle number in the NPK ratio). Phosphorus is the element that encourages bloom production.

Should I deadhead hydrangeas?

Since hydrangea blossoms are so big, deadheading a hydrangea makes a real difference in diverting energy to more important parts of the plant's growth. You should carry out this practice all through the blooming season to encourage new blossoms and keep your plant looking fresh.

Why is my hydrangea not flowering?

There are several factors which can contribute to your Hydrangea's lack of blooms, including frost damage, too much fertilizer, and improper pruning. The most common reason is pruning, either too much or at the wrong time.

Will hydrangeas spread?


Most hydrangeas thrive in rich, porous, somewhat moist soils. Add compost to enrich poor soil. They prefer full sun in the morning, with some afternoon shade; however, many will grow and bloom in partial shade. Space multiple hydrangeas about 3 to 10 feet apart.

Do hydrangeas multiply?

Multiply Your Plants
Hydrangeas respond well to several propagation techniques, including layering and dividing. But Dirr's method for rooting softwood cuttings in summer will yield a bunch of new plants in about four weeks. Cut a softwood shoot that has several leaves.

Do hydrangeas need a lot of water?

Hydrangea Plant Care: Water Requirements
Hydrangeas absorb water quickly. Keep the soil of hydrangea plants evenly moist and well drained, though this can take watering your plants possibly more than once per day. Hydrangeas grown outdoors as shrubs and garden plants do not need as much attention to watering.

Can you grow hydrangeas in pots?

Planting hydrangeas
Pot grown hydrangeas can be planted at any time of year, in the open ground or in pots and containers using Vitax John Innes compost. Choose nice big pots that will allow the plants to grow happily for several years. Small containers dry out too quickly.

How do you winterize hydrangeas?

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.

Can you root hydrangeas in water?


Some people have rooted them in water, but many others (such as myself) have never been able to make this work. Susan Park Cole sent us the picture to the right demonstrating that it is possible to root hydrangeas in water. Occasionally roots form when one leaves an arrangement in water for a long time.

When can I cut the sticks out of my hydrangeas?

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.

Do you trim hydrangeas in the fall?

Fall Blooming
Prune in late winter and early spring. Prune as far back as you want right above the first leaf joints. It will grow from that point onward, getting larger each year. Read more about pruning hydrangeas, and learn whether your shrub blooms on old or new growth in “Pruning Hydrangeas” by Janet Carson.