Coastal Planting: What Actually Survives Salt and Wind
Gardening near the coast on the Mornington Peninsula comes with challenges that gardeners a few suburbs inland simply don’t face. Salt-laden wind, sandy soil, intense summer sun reflected off water, and exposure that can shred delicate plants in a single afternoon.
But coastal gardens can also be some of the most beautiful. The trick is working with the conditions, not against them.
Understanding Coastal Exposure
Not every bayside property cops the same conditions. A garden in Rye facing Bass Strait gets hammered far harder than one in Mornington tucked behind the hill. Before choosing plants, honestly assess your exposure:
- Frontline — directly facing the bay or ocean, no windbreak. Only the toughest plants survive here.
- Second row — some protection from buildings or fencing, but still salt spray and wind. Most coastal-tolerant plants do well.
- Sheltered coastal — a few streets back or behind good screening. You can grow almost anything with decent soil preparation.
Frontline Survivors
These plants genuinely handle salt spray, wind, and sandy soil without complaining:
- Coastal Rosemary (Westringia fruticosa) — the workhorse of Peninsula coastal gardens. Dense, neat, flowers year-round, tolerates everything.
- Cushion Bush (Leucophyta brownii) — silvery-grey mounding plant that’s almost indestructible in coastal conditions.
- Pig Face (Carpobrotus) — the ultimate ground cover for sandy, exposed banks. Bright flowers, zero maintenance.
- NZ Flax (Phormium) — dramatic sword-like foliage, handles wind and salt beautifully. Great structural plant.
- Banksia integrifolia (Coast Banksia) — native tree that provides shelter and wildlife habitat. Tough as nails.
- Correa — compact native shrubs with tubular flowers. Birds love them and they handle coastal exposure well.
Second Row — More Options
Once you’ve got some shelter (from a fence, a frontline hedge, or a building), your options open up:
- Rosemary — loves sandy, well-drained soil and coastal conditions. Use it as a low hedge or ground cover.
- Lavender — thrives in the Peninsula’s conditions once established. Needs full sun and sharp drainage.
- Agapanthus — practically synonymous with bayside gardens for good reason. Evergreen, drought-tolerant, and reliable.
- Lomandra — native grass-like plant that handles anything. Excellent as mass planting or borders.
- Metrosideros (NZ Christmas Bush) — brilliant red flowers, tough as anything in coastal conditions. Good small tree or hedge.
- Oleander — incredibly tough, flowers all summer, handles salt and wind. Keep away from kids and pets though — all parts are toxic.
The Windbreak Strategy
If your garden is exposed, the smartest first investment is a windbreak. A hedge or screen planting on the exposed side transforms what you can grow behind it.
Good windbreak plants for the Peninsula:
- Pittosporum tenuifolium — fast-growing, dense, handles salt.
- Westringia — slower but very dense and low-maintenance.
- Leptospermum (Tea Tree) — native, fast, and creates good shelter.
- Coprosma — tough glossy-leaved shrubs, many varieties available.
Plant your windbreak first, give it a year or two to establish, and then start planting the things you really want in the sheltered area behind it.
Roses by the Coast
People often think you can’t grow roses near the coast, but that’s not true — you just need to choose carefully. Rugosa roses are the most salt-tolerant, and many modern David Austin varieties handle coastal conditions surprisingly well if they have some shelter from direct salt spray.
The key is good soil preparation (lots of compost in that sandy ground), regular feeding, and not planting them right on the frontline. A rose garden behind a good hedge or fence, even a street or two from the water, will do perfectly well.
The Golden Rule of Coastal Planting
Prepare the soil first. Even the toughest coastal plant will struggle if it’s planted in pure sand with no organic matter. Dig compost through generously, mulch thickly, and water new plants in well. Coastal-tolerant doesn’t mean neglect-tolerant — at least not until plants are established.