2 saves
Isopogon
We track 3 varieties; the ones most used by real gardeners.
The 3 most-saved Isopogon varieties
3 species of Isopogon
Each one is a parent of the varieties above.
Track your Isopogon in Sow
Save the Isopogon you grow and get care reminders timed to your zone.
How to grow Isopogon
Whats common across all Isopogon varieties in our catalog — drawn from the care records of the 3 most-grown of them.
The Isopogon year
- PruneMay100% of varieties
Tip-prune spent flower heads to maintain a compact shape, avoiding cutting into old wood.
- FertilizeMarch and April100% of varieties
Apply a low-phosphorus native fertiliser sparingly if growth is slow.
- Check for PestsJune and July100% of varieties
Inspect stems for borers and check foliage for signs of dieback.
Do
- Use only low-phosphorus fertilisers formulated specifically for native Proteaceae.
- Prune lightly immediately after flowering to maintain a dense, rounded habit.
- Ensure the soil drains rapidly after heavy rainfall.
- Prune lightly immediately after flowering to maintain a compact, bushy form.
- Ensure excellent air circulation around the foliage to prevent fungal issues during humid periods.
Avoid
- Do not prune back into old, leafless wood as it lacks dormant buds and will not reshoot.
- Do not plant in heavy clay soils or low-lying areas prone to waterlogging.
- Do not use standard garden fertilisers containing high levels of phosphorus.
- Do not prune hard into old, bare wood, as dormant buds will fail to reshoot.
What goes wrong with Isopogon
| Problem | What you'll see | What to do |
|---|---|---|
| Borers | Dieback of individual branches, entry holes in stems, and frass accumulation. | Prune out infested stems well below the damaged area and dispose of the waste. |
| Possums and Cockatoos | Chewing or snapping of soft branch tips, bark stripping, or flower bud removal. | Install physical barriers or deterrents if damage becomes severe. |
| Possums and Parrots | Chewed tender new tips and damaged flower buds. | Install temporary wire netting or cages over young plants until they are established. |
| Scale insects | Small, raised brown or white bumps on stems and foliage, accompanied by sticky honeydew or black sooty mould. | Prune away heavily infested stems or apply a horticultural oil spray during cooler hours to suffocate the insects. |
| Phytophthora dieback (Phytophthora cinnamomi) | Sudden wilting, collar rot, leaf yellowing, and rapid collapse of the plant. | Ensure flawless drainage, avoid overwatering, and apply phosphite treatments preventatively. |
| Phytophthora Dieback | Sudden wilting of branches, yellowing foliage, and collar rot at the soil line. | Improve soil drainage, apply strict hygiene practices, and use phosphonate fungicides preventatively. |
Making more Isopogon
Semi-hardwood cuttings
- Take 7-10 cm cuttings of semi-hardwood growth during the warmer months.
- Remove the lower leaves and dip the base in a rooting hormone.
- Insert into a free-draining propagation mix of perlite and peat.
- Apply bottom heat and maintain moderate humidity until roots establish.
Seed
- Collect seeds from mature, dry cones retained on the plant.
- Sow into a sterile, sandy seed-raising mix.
- Apply a liquid smoke treatment to assist with germination.
- Keep moist but not wet in a warm, sheltered position.
Isopogon questions
How many types of Isopogon are there?
The Sow catalog tracks 3 distinct Isopogon varieties. The most popular — ranked by 2 real gardeners — are shown first above.
What zones does Isopogon grow in?
Across its varieties, Isopogon covers USDA Zones 9–10. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Isopogon bloom?
Most Isopogon varieties bloom in winter, late spring. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Isopogon should I choose?
Start from the most-saved varieties above — popularity across thousands of gardens is a strong signal of reliability — then filter by your zone and sun. In the Sow app you can preview any of them in a photo of your actual yard before you buy.