Potted hydrangeas: choosing, planting and growing them successfully on the patio

A potted hydrangea does very well on a partially shaded patio or balcony, provided you choose a compact variety, a large enough pot with drainage holes, and a potting mix that stays moist.

The Hydrangea genus includes several species with different needs: bigleaf hydrangea (Hydrangea macrophylla) is the most widely grown, but compact panicle hydrangeas and Hydrangea serrata also do well in containers.

This guide covers the species, pot, potting mix, placement, watering, overwintering, and pruning, drawing on the RHS and American universities; learn more about the plant itself in our complete hydrangea guide.

🌟 Can hydrangeas live in pots? Yes, with a few conditions

Yes, hydrangeas can live in pots for years, provided you choose a compact variety, give them a well-drained, large-enough pot, and never let the potting mix dry out.

According to the RHS (Royal Horticultural Society) guide to shrubby hydrangeas, compact Hydrangea macrophylla cultivars are suitable for containers, and container-grown hydrangeas can be planted at any time of year, except when the ground is frozen, waterlogged, or very dry. NC State Extension confirms that they can be grown in containers.

📊 Hydrangeas suited to pots: a species comparison

The best hydrangeas for pots are compact Hydrangea macrophylla, Hydrangea serrata, and compact Hydrangea paniculata; larger panicle hydrangeas and 'Annabelle' hydrangeas need a large planter, while climbing hydrangeas are so vigorous that they are best planted in the ground. Information is from RHS plant profiles unless otherwise noted; hardiness ratings apply to plants in the ground. To compare varieties for the garden, see our hydrangea variety comparison.

📋 Quick reference

General guidelines for growing hydrangeas in pots, based on the RHS and the university extensions cited.

🪏 How to plant a hydrangea in a pot in 7 steps

To plant a hydrangea in a pot, choose a container with drainage holes that is slightly larger than the root ball, use potting mix suited to the color you want, and set the plant at the same depth as in its original pot before watering thoroughly. The RHS notes that hydrangeas are often sold in 3-liter pots.

For advice on materials, see whether a terracotta or plastic pot is the better choice.

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🧭 Outdoor potted hydrangeas: placement, patios, and balconies

Outdoor potted hydrangeas are best placed in partial shade, with morning sun and protection from the hot afternoon sun. The RHS recommends light shade, or a sunnier spot if the potting mix does not dry out in summer, and advises moving pots into the shade in midsummer. Also avoid windy corners and frost pockets (RHS).

To complete your container garden, see our plants for balconies and patios.

📐 Caring for potted hydrangeas: watering and fertilizer

Caring for a potted hydrangea mostly comes down to watering: the potting mix must never dry out completely, because pots dry out much faster than the ground.

According to the RHS guide to container maintenance, in hot or windy weather you should check the moisture in pots very regularly, and even more often in extreme heat; check, but don't water automatically. Water when the top 2 to 3 cm of potting mix is dry, using rainwater for blue cultivars or tap water if necessary (RHS).

As for fertilizer, the RHS notes that too much causes soft growth: a slow-release fertilizer when repotting or top-dressing is enough, and none in winter. Also see our guide to watering plants in summer.

📐 Potting mix and color: blue, pink, or white potted hydrangeas

The color of pink or blue Hydrangea macrophylla depends on the acidity of the potting mix: flowers stay blue in acidic conditions and turn pink in neutral to alkaline conditions, while white flowers do not change color. The RHS puts blue at a pH of around 4.5 to 5 and classifies soil with a pH of 6.5 to 7 as neutral.

UConn gives similar guidelines: pH 4.0 to 5.0 for blue flowers, which makes soil aluminum available for uptake, and pH 6.0 to 7.0 for pink. According to University of Missouri Extension, aluminum is what turns flowers blue, and Oregon State University places purple shades between pH 5.5 and 6.5.

A pot is therefore the easiest way to grow blue flowers in alkaline soil, using an ericaceous mix for ericaceous plants (RHS). For pink or white flowers, the RHS recommends 2 parts loam-based potting mix to 1 part peat-free multipurpose potting mix.

📐 Potted hydrangeas in winter: protecting them from frost

Yes, potted hydrangeas are more vulnerable to frost than those planted in the ground—not because of their stems, but because of their roots and flower buds. According to UMass Amherst, roots are much less hardy than stems and, unlike plants in the ground, the roots of container-grown plants are not protected from the cold by the soil.

The RHS says wrapping the pot is unnecessary in mild regions, but recommends raising it on feet and sheltering it, for example in an unheated greenhouse, from late frosts. In an exposed site, the RHS guide to growing trees in containers recommends wrapping the container in bubble wrap or burlap.

Group pots against a wall and cover them with thick fleece, which provides about 2°C of protection (RHS). For all the methods, read our guide to protecting plants from frost.

📐 Potted hydrangeas indoors: a flowering gift, and what comes next

A flowering potted hydrangea can brighten your home for a few weeks, but it will not live indoors long-term: it is an outdoor shrub.

According to Iowa State University Extension, it needs bright but indirect light, a cool room at about 16 to 18°C, and watering as soon as the potting mix feels dry to the touch, without letting water stand in the cachepot.

University of Missouri Extension says it will look good for several weeks if kept moist, and that the flowers wilt before the leaves if it lacks water. Iowa State notes that these florist cultivars, which are not very hardy in Iowa, rarely rebloom, and recommends discarding them after flowering.

In mild regions, the University of Missouri suggests putting it outside once the risk of frost has passed, or even planting it in the garden: give it a try, but don’t count on it blooming again, as florist’s cultivars are less hardy than nursery-grown ones, according to the University of Connecticut (UConn).

For more ideas, see our guide to which plant to give as a gift.

🗓️ The potted hydrangea calendar, season by season

Potted hydrangeas need the most attention in spring, for pruning and top-dressing, and in summer, for watering. Each spring, remove about 5 cm of topsoil and replace it with fresh potting mix, as the RHS recommends for container plants. Move it to the next pot size up when the roots fill the container (RHS).

For pruning other shrubs this season, see our guide to spring pruning.

📅 Seasonal care calendar

🐛 Mistakes to avoid with potted hydrangeas

The most common mistakes with potted hydrangeas involve choosing the wrong pot, letting the potting mix dry out, or pruning at the wrong time.

🌿 Our potted hydrangeas and their care guides

Each species has its own complete guide; our compact varieties should be planted in a pot slightly larger than the container they come in.

🔑 When to prune potted hydrangeas by species

Pruning potted hydrangeas follows the same rules as pruning those in the ground: it depends on the species, because they don’t all flower on the same wood. For Hydrangea macrophylla and serrata, the RHS recommends light pruning in mid-spring, as flowers form on new shoots growing from last year’s stems; also remove one or two of the oldest stems.

Leave spent flowers in place throughout winter to protect tender young shoots from frost, then cut them off at that time. For Hydrangea paniculata and Hydrangea 'Annabelle', the RHS recommends pruning in early spring, before growth resumes, keeping a low framework, often no more than 25 cm tall.

Groundbreaker Ruby needs little or no pruning, according to the RHS. For Endless Summer rebloomers, UConn says that removing spent flowers encourages new blooms. For detailed instructions, see our panicle hydrangea guide.

🔑 Potted hydrangeas and pets: what you need to know

Hydrangeas are harmful if eaten by a dog or cat.

The ASPCA (American Society for the Prevention of Cruelty to Animals) does not have an entry for Hydrangea macrophylla: its hydrangea entry covers Hydrangea arborescens, which is classified as toxic to dogs, cats, and horses due to a cyanogenic glycoside; clinical signs include vomiting, depression, and diarrhea.

For Hydrangea macrophylla, the RHS states “Pets (dogs, cats): Harmful if eaten” and identifies it as a skin allergen: wear gloves when pruning. NC State Extension rates its toxicity as low severity. Place the pot out of reach of pets that chew on leaves.

✅ Our tips for growing potted hydrangeas successfully

For success with potted hydrangeas, choose a compact variety, such as a reblooming macrophylla or a Groundbreaker panicle hydrangea, place it in partial shade in a pot with drainage holes, and keep the potting mix cool and moist to the touch all summer.

Find our varieties among our flowering shrubs, and for other acid-loving shrubs, browse our rhododendrons and azaleas or our balcony and patio plants.