How to Grow Hydrangea
Hydrangea At a Glance
Difficulty
Easy
Category
Flower
Sun Exposure
Partial Shade
Frost Tolerance
Frost Hardy
Cold Hardiness
Survives to -29°C
Plant Family
Hydrangeaceae
Growing Season
Warm Season
Plant Lifecycle
Perennial
How to Start It
★ Recommended for beginners
Buy a hydrangea in a pot and plant it in spring around your last frost, or in early fall. Dig a hole twice as wide as the pot, set the plant at the same depth it grew, about 120 cm from its neighbours, and water deeply. In cold areas choose a panicle or smooth type such as Annabelle, which flower reliably after hard winters.
Hydrangeas are easy shrubs with huge flower heads all summer, and the only tricky part is pruning. Panicle types (cone-shaped flowers) and smooth types like Annabelle bloom on new stems, so you can cut them back hard in early spring. Bigleaf types (round blue or pink mopheads) bloom on last year's stems, so cut them only lightly, or you remove the flowers.
When To Start
Hydrangea needs warmth. Wait until your last frost has passed and the soil has warmed before sowing.
We do not have exact sowing dates for this one yet.
When should you plant Hydrangea?
Your planting dates depend on your local climate. Sign up and add your location to unlock personalized dates.
Your Hydrangea Planting Window
Start planting
May 15, 2026
Last chance
Sep 10, 2026
Your Hydrangea Calendar
Set your location to turn these into exact dates and reminders.
Plant your hydrangea where it gets morning sun
Around your last frost· every year
Prune hydrangea by type: hard only for panicle and smooth
30 days before your last frost· every year· optional
Mulch your hydrangea to keep the roots moist
2 weeks after your last frost· every year· optional
Water your new hydrangea plants well while they settle in. Deep and slow is best.
About 1 days after you plant it
Hello! Hydrangeas drink a lot, so water deeply at the base, especially in hot weather.
About 30 days after you plant it
Looking lovely! Mulch around your hydrangea to keep the roots cool and moist.
About 90 days after you plant it
The Journey Ahead
Hydrangea's Lifecycle
Seedling
Mature Plant
Seed Production
Step 1
Prepare Your Space
120 cm
Plant Spacing
30 cm
Row Spacing
Vertical Growing
No.
Succession Planting
No.
Good Companions
Bad Companions
Step 2
Planting & Sprouting
Growing Tips
- 1Most hydrangeas like morning sun and afternoon shade, though panicle types handle full sun.
- 2Mix plenty of compost into the soil and keep a layer of mulch over the roots to hold in moisture.
- 3Water deeply whenever the top few cm of soil is dry, since hydrangeas wilt fast in heat.
- 4Feed with compost or worm castings each spring.
- 5On bigleaf types, the soil decides the colour: acid soil gives blue flowers, chalky (alkaline) soil gives pink, and white flowers stay white.
- 6Hydrangeas are toxic to people, cats and dogs if eaten, so keep pets and small children from chewing the leaves and flowers.
Seedling Phase
Step 3
Growth & Maturity
150 cm
Mature Height
150 cm
Mature Width
Pests to Watch For
Diseases to Watch For
Mature Plant
Step 4
Harvesting
When to Pick
Blooms through summer; flowers dry beautifully and last for weeks
How to Harvest
- 1Cut flowers for a vase in the morning and put the stems straight into water.
- 2For dried flowers, wait until late summer when the petals feel papery, then hang the stems upside down in a dark, airy spot.
- 3Snip off faded flower heads just above the first pair of healthy leaves.
- 4In early spring, cut panicle and smooth types back by a third to a half for strong stems and big flowers.
- 5On bigleaf types, only remove dead stems and old flower heads in spring, since next summer's buds are already on the stems.
Step 5
Saving Seeds
Seed Production
Still have a question?
Ask your coach about your hydrangea.
This page covers what we thought to write down. Your hydrangea will do something it never mentions, and that is the day a coach beats a guide. Ask Coach Lumen one question right now, free, no account.
