Domakihub How to Grow Hydrangeas: A Complete Care Guide
Choose the right variety, master watering and soil pH, and enjoy spectacular blooms all season long.
Reviewed by Domakihub garden pros · 2026-06-23 · 5 min read
Hydrangeas are one of the most rewarding flowering shrubs you can plant in a Greek garden, a hotel courtyard, or a holiday-rental terrace — their full, spherical blooms create an instant impression that guests remember. The video above walks through variety selection and hands-on planting technique; the steps below give you the complete seasonal care roadmap so your hydrangeas thrive from the first summer onwards. Whether you have a shaded villa garden on Corfu or a sun-baked patio in Crete, there is a hydrangea that will work for you.
Why Hydrangeas Work So Well in Greek Climates
Greece's Mediterranean summers are hot and dry, which sounds like the enemy of moisture-loving hydrangeas — but with the right siting and watering routine they perform brilliantly. Bigleaf hydrangeas (Hydrangea macrophylla) and oakleaf hydrangeas (H. quercifolia) cope particularly well when planted in morning-sun, afternoon-shade positions, such as the east-facing wall of a villa or beneath a pergola. Panicle hydrangeas (H. paniculata) are the most heat-tolerant and can handle more direct sun, making them a safe choice for exposed hotel entrances or rooftop gardens.
Greece's alkaline tap water and calcareous soils naturally push soil pH above 7, which will turn most bigleaf hydrangeas pink. If you want the classic blue colour, you need to acidify the soil by adding sulphur chips or using a specialist ericaceous compost — something worth understanding before you invest in planting.
Soil, Sun, and Spacing Fundamentals
Hydrangeas thrive in rich, moisture-retentive soil with good drainage. Before planting, work in generous amounts of compost or well-rotted manure to improve both water retention and fertility. In Greece's stony, free-draining soils this step is not optional — skipping it is the single biggest reason hydrangeas fail to establish. A soil pH between 5.5 and 6.5 produces the deepest blue flowers; pH 6.5 to 7 gives purples and mauves; above 7 the flowers turn pink to red.
Space shrubs at least 90 cm apart — most varieties spread 1–1.5 m wide at maturity. Crowding hydrangeas restricts airflow, encourages powdery mildew (a real problem in humid Greek coastal summers), and results in fewer flowers per plant. For formal hotel entrances or rental-property borders, a spacing of 1.2 m gives a full, lush hedge effect within two growing seasons.
5 Steps to Grow Hydrangeas Successfully
- 1
Choose the Right Variety for Your Site
Before buying, assess how many hours of direct sun the planting spot receives and test or estimate your soil pH. For shaded courtyards and north-facing walls, bigleaf (H. macrophylla) or climbing hydrangeas (H. anomala) are ideal. For exposed, sunnier spots — hotel driveways, open terraces — choose panicle hydrangeas, which flower later (July–September) and handle more heat. Smooth hydrangeas (H. arborescens 'Annabelle') are near-indestructible and give huge white blooms even in tough conditions, making them a reliable pick for rental properties where ongoing maintenance is low.
- 2
Prepare the Soil and Plant Correctly
Dig a hole twice the width of the root ball and the same depth. Mix the excavated soil 50/50 with high-quality compost or peat-free ericaceous compost. Place the plant so the crown sits level with the surrounding soil — planting too deep causes stem rot, too shallow leaves roots exposed to summer heat. Backfill, firm down gently to remove air pockets, and water in thoroughly. Immediately apply a 5–8 cm mulch of wood chip or composted bark over the root zone, keeping it 10 cm clear of the stem; this is critical for moisture retention through the Greek summer.
- 3
Water Deeply and Consistently
New hydrangeas need 2–3 deep waterings per week during the first summer — 10–15 litres per plant per session rather than frequent light sprinkles. Established plants (after year two) still need weekly deep watering from May through September in Greece. Drooping leaves in the morning indicate drought stress; drooping only in the afternoon heat is normal and no cause for alarm. Drip irrigation or soaker hoses placed beneath the mulch are by far the most efficient method and will reduce your water bill significantly compared with overhead sprinklers.
- 4
Feed and Adjust pH for Better Blooms
Apply a slow-release fertiliser formulated for flowering shrubs in early spring as new growth emerges, then again in early June. Avoid high-nitrogen feeds after July — they push leafy growth at the expense of late-summer blooms and make plants more vulnerable to frost damage. To shift flowers towards blue, apply aluminium sulphate (garden sulphate of alumina) around the root zone in early spring, following pack rates; repeat each year because Greece's alkaline water gradually reverses the effect. To maintain or deepen pink flowers, add garden lime to raise pH.
- 5
Prune at the Right Time for Each Variety
Pruning at the wrong time is the most common reason hydrangeas fail to flower. Bigleaf and oakleaf hydrangeas bloom on last year's wood ('old wood') — prune them only immediately after flowering ends in late summer, removing spent flowerheads and any dead or crossing stems. Never cut them back hard in autumn or spring or you remove next year's flower buds. Panicle and smooth hydrangeas bloom on new growth ('new wood') and can be cut back by one-third to one-half in late winter or early spring, which actually encourages larger flower clusters. When in doubt, deadhead spent blooms only and do nothing more drastic until you have identified your variety.
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FAQ
- Why are my hydrangea leaves wilting in the midday heat even though I water regularly?
- Afternoon wilting in hot Greek summers is almost always a heat-response rather than a sign of drought — hydrangeas temporarily close their stomata to reduce water loss when temperatures exceed 30°C. Check moisture levels by probing 10 cm into the soil; if it is still damp, no extra watering is needed. If it is dry, increase your irrigation volume rather than frequency. Moving a potted hydrangea to a shadier afternoon position will stop the wilting entirely.
- How do I get blue hydrangeas when my water and soil are so alkaline?
- Greek tap water is generally hard (pH 7–8), which continuously works against blue colour in bigleaf hydrangeas. You need to fight on two fronts: amend the soil with sulphur chips or ericaceous compost in spring, and water with collected rainwater where possible. Apply aluminium sulphate (10 g per litre of water) as a soil drench three times in spring at two-week intervals. Results take a full growing season to show and you must repeat every year. Some named varieties like 'Nikko Blue' and 'Endless Summer' hold blue more readily than others even in moderately alkaline soil.
- Can I grow hydrangeas in pots on a Greek terrace or balcony?
- Yes — panicle and smooth hydrangeas perform best in containers because they tolerate more sun and heat. Use a large pot (at least 40 cm diameter) with drainage holes, fill with a mix of loam-based compost and perlite, and place in a spot that gets morning sun but is shaded from 1 pm onwards. Container plants dry out two to three times faster than in-ground plants in summer, so daily watering is often necessary in July and August. Feed every two weeks with a liquid flowering-plant fertiliser. Repot into a slightly larger container every two to three years to keep growth vigorous.