How can I save my potted protea that is browning and sparse?

What's likely going on

From the photo, this looks like a protea in a large pot. Parts of the plant still have healthy green leaves and flowers, but many leaves are brown, spotty, and some stems look bare or dead.

With proteas in containers, the most common problems are:

1. Poor drainage or over‑watering – Proteas hate sitting in wet soil. Heavy potting mixes or saucers that hold water can cause root rot. Above ground, this shows up as browning leaves from the inside of the plant outward and gradual dieback of stems.
2. Soil too rich or fertilised – Proteas naturally grow in poor, sandy soil. Regular potting mix with added fertiliser (especially phosphorus) can burn roots and weaken the plant.
3. Stress from heat or wind – In full, reflected sun (like against a fence/deck), a pot can heat up and dry quickly. If watering doesn’t keep up, tips and older leaves brown, while some parts still look fine.

The fact that you still have good flowers means it’s not beyond saving, but it is under stress.

What to do

1. Check drainage first
   Make sure the pot has large holes and that water runs out freely when you water. Empty any saucer after 10–15 minutes.

2. Test the soil
   Push a finger or stick down into the mix. If it stays wet and heavy for days, the mix is too dense or you’re watering too often. Let it dry to at least a few cm down before the next deep watering.

3. Prune dead and badly damaged growth
   Cut out obviously dead, brittle stems and the worst brown leaves. This reduces stress and helps you see what’s still alive. Don’t cut into green, flexible wood too hard; proteas don’t always reshoot from old wood.

4. Repot into a better mix (if roots are struggling)
   On a cool day, slide the plant out. If you see black, mushy roots or very compacted soil, gently tease the root ball and repot into a slightly bigger pot with a very free‑draining, low‑nutrient mix: lots of coarse sand, fine gravel, and pine bark, or a commercial “native”/proteaceae mix. Avoid fertiliser, especially anything high in phosphorus.

5. Adjust watering
   After repotting, water once thoroughly to settle the mix. Then water deeply but less often, letting the top layer dry between waterings. In hot weather you may need more frequent checks, but still avoid constant dampness.

6. Give it kinder conditions
   Keep it in full sun but, if possible, avoid the harshest reflected heat from decks or walls. Light air movement is good.

How to prevent it

• Always grow proteas in very free‑draining, low‑fertility soil. Regular rich potting mix and frequent feeding cause long‑term decline.
• Water by soaking the pot until water runs out, then wait until the top few centimetres are dry before watering again.
• Never let the pot sit in a tray of water for long periods.
• If fertilising, use a very light dose of a fertiliser labelled safe for native/proteaceae plants, once or twice a year at most.

When to worry

• If stems turn brown and brittle all the way down to the base, and no parts stay green and flexible, that stem is dead and won’t recover.
• If new growth and flower buds also start to brown and shrivel, root damage may be severe.
• A full, soft collapse of foliage usually means advanced root rot; recovery is less likely.

As long as you still have some strong green leaves and flowers, there’s a good chance the plant can stabilise with better drainage, gentler soil, and careful watering.