How to Protect Your Plants and Trees Through a Ballarat Frost Season

Ballarat frosts are not gentle. We regularly hit -7°C before breakfast and that kind of cold will expose any weakness in your garden fast. The good news is that a bit of preparation before the worst nights makes a real difference to how your plants come through.

Here's what we tell customers who want to give their trees and plants the best shot at a good winter.

Start with the right plants

This is the most important decision you make and it happens before anything goes in the ground.

There's a difference between frost tolerant and frost hardy. Frost tolerant plants can survive a frost. Frost hardy ones are genuinely built for it and don't even flinch. If your plant is planted somewhere exposed or somewhere that gets the full force of a still clear Ballarat night, some young frost tolerant plants may need protection in their early years.

Plants and trees that have been grown out in the open in Ballarat conditions are already acclimatised. They've been through the frosts before. That's why we grow our entire range outdoors at the nursery rather than in protected shade structures. It means every tree that leaves here has already handled our weather.

Water before a frost, not after

This one surprises people. Dry plants are more vulnerable to frost than well-watered ones. Water holds heat better than dry soil does, so giving your trees and plants a good deep soak the day before a forecast frost can make a real difference overnight.

Use a frost protectant spray on younger plants

We recommend Envy spray for younger or more vulnerable plants and trees. It works a bit like sunscreen, giving the plant a buffer against cold. It can hold off an extra three to four degrees of frost, which on a -5°C night is significant.

It's not a permanent fix and it won't save a frost-sensitive plant from a bad Ballarat winter. But for trees in their first or second season, while they're still putting down roots and building strength, it buys them time.

Seasol monthly through winter

Seasol won't feed your plants, but it does help them manage stress. A monthly soak through the colder months keeps plants as healthy as possible so they're better placed to handle cold snaps and recover from any damage.

Avoid fertilising through winter. New soft growth is the first thing frost burns and fertiliser pushes that growth on. Save the feeding for spring.

Mulch the base

A layer of mulch around the base of your trees and plants insulates the root zone. It smooths out the overnight temperature swings that do a lot of the damage as well as holding soil moisture.

You need to keep the mulch away from the trunk itself, because mulch sitting against bark can trap moisture and create the right conditions for fungal disease and collar rot at the base of the tree. A gap of around 10cm is enough.

Frost cloth for sensitive plants you can't move

If you've got plants in pots, get them under cover on forecast frost nights. For anything in the ground that needs some protection, frost cloth draped over the plant in preparation for those really bad nights and removed during the day can get it through.

What to do if frost damage appears

After a serious frost, you'll sometimes see discolouration, wilting, or blackened tips on leaves. Don't rush to prune it off. Wait until the worst of the frost season has passed before cutting back dead growth.

Pruning too early can expose fresh tissue to more frosts and the damaged growth, as ugly as it looks, provides some insulation.

In Ballarat, the main frost risk runs roughly from April through to late October, sometimes into November.

A quick prune in spring will tidy things up fast and most trees bounce back better than you'd expect.

If you're not sure which trees and plants are right for your Ballarat garden, book a guided 1:1 nursery tour with our qualified horticulturalist. We know the local conditions and we can point you toward plants and trees that will actually thrive here, not just survive.

Book a nursery appointment at ballaratnursery.com