Why Your Hydrangeas Look Terrible (And How to Fix Them)
Hydrangeas should be one of the easiest flowering shrubs in a bayside garden. They flower for months, they’re tough, and they come in gorgeous colours. So why do so many of them look awful?
Usually, it’s one of three things: bad pruning, wrong spot, or neglect. All fixable.
Problem One: You’ve Pruned Them Wrong
This is the most common hydrangea crime. Someone decides the bush is too big, chops it to the ground in winter, and then wonders why there are no flowers for an entire year.
Most common hydrangeas (the mophead and lacecap types — Hydrangea macrophylla) flower on last year’s wood. That means the stems that grew this year will produce flowers next year. If you cut all the stems off, you’ve removed all next year’s flowers.
How to prune correctly:
- In late winter or early spring, remove only the stems that flowered last year. You can identify them by the old, dried flower heads still attached.
- Cut these stems back to the first pair of fat, healthy buds below the old flower.
- Leave all the stems that didn’t flower — these are this year’s flower producers.
- Remove one or two of the oldest, thickest, woodiest stems at ground level each year. This encourages fresh growth from the base.
That’s it. No hedge-trimmer massacres. No cutting everything to stumps.
The exception: Hydrangea paniculata (the cone-shaped flower type, like ‘Limelight’) flowers on current season’s growth, so it can be pruned hard in late winter. If you’re not sure which type you have, don’t prune hard until you’ve identified it.
Problem Two: Wrong Spot
Hydrangeas want:
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Morning sun, afternoon shade — full sun on the Peninsula, especially in an exposed bayside position, cooks them. They’ll survive, but flowers fade fast and leaves scorch. The ideal spot gets direct sun until about midday, then dappled or full shade for the afternoon.
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Shelter from hot wind — a hydrangea in a wind tunnel will always struggle. Plant them where they’re protected by a fence, building, or larger shrubs.
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Consistent moisture — this is the big one. Hydrangeas are thirsty plants and they let you know when they’re dry by drooping dramatically. On sandy Peninsula soil, they need regular deep watering and plenty of organic matter in the soil to hold moisture.
If your hydrangea is in full blazing sun with no windbreak and sandy soil, it’s going to look stressed no matter what you do. Either move it (autumn is the best time) or improve its conditions with heavy mulching and supplementary watering.
Problem Three: They’re Hungry
Hydrangeas are moderate feeders, but on Peninsula sand, nutrients wash through fast. Feed twice a year:
- September — a complete organic fertiliser as new growth starts.
- March — a lighter feed to sustain them through autumn.
Don’t over-feed with nitrogen or you’ll get lots of leaves and few flowers. A balanced fertiliser is better than straight blood and bone.
Changing the Colour
This is the party trick of hydrangeas. Mophead varieties change colour based on soil pH:
- Acidic soil (pH below 6) = blue flowers
- Alkaline soil (pH above 7) = pink flowers
- Neutral soil = purple or muddy in-between
Most Peninsula soil is slightly acidic to neutral, so hydrangeas tend towards blue or purple naturally.
To push them bluer, water with aluminium sulphate dissolved in water (available at garden centres) a few times in spring. To push them pinker, add garden lime around the base.
White hydrangeas stay white regardless of soil pH.
The Recovery Plan
If your hydrangea is a mess — sparse, leggy, no flowers — here’s the recovery plan:
- Stop pruning hard. Leave it alone for a full year to rebuild flowering wood.
- Improve the soil. Spread a thick layer of compost and mulch around the base.
- Water deeply twice a week through the warmer months.
- Feed in September with a balanced organic fertiliser.
- Reassess the position. If it’s in full sun or total shade, consider moving it in autumn to a spot with morning sun and afternoon shade.
Give it two seasons. Most hydrangeas recover beautifully once they’re getting the basics right. They’re far tougher than people think — they just have opinions about how they’d like to be treated.