Also known as She-oak · 16 saves
Allocasuarina
Allocasuarina, the genus most gardeners know as she-oak. We track 5 varieties; the ones most used by real gardeners.
The 5 most-saved Allocasuarina varieties
5 species of Allocasuarina
Each one is a parent of the varieties above.
Track your Allocasuarina in Sow
Save the Allocasuarina you grow and get care reminders timed to your zone.
How to grow Allocasuarina
Whats common across all Allocasuarina varieties in our catalog — drawn from the care records of the 5 most-grown of them.
The Allocasuarina year
- PruneMarch–June100% of varieties
Lightly trim young plants to shape or form windbreaks; avoid cutting into old, leafless wood.
- FertilizeMarch and April100% of varieties
Apply a low-phosphorus, slow-release native fertilizer sparingly at the start of the growing season.
- Check for PestsJune and July100% of varieties
Inspect the dense inner branchlets for scale insects and aphids, treating with horticultural oil if necessary.
- MulchOctober and November40% of varieties
Apply a fresh layer of organic mulch around the root zone before winter, keeping it clear of the trunk.
- Winter PrepNovember40% of varieties
Protect young, newly planted specimens from heavy frosts using burlap wraps or frost cloth.
Do
- Plant in exceptionally well-drained soil to prevent root rot.
- Use low-phosphorus fertilizers formulated specifically for native plants if feeding is necessary.
- Water young plants regularly during their first dry season to establish a deep root system.
- Plant in wet or poorly drained areas where other shrubs struggle.
- Use a low-phosphorus fertilizer formulated specifically for Australian native plants.
Avoid
- Do not prune heavily into old, brown, leafless wood as the plant cannot regenerate from bare timber.
- Do not allow the soil to become waterlogged or soggy.
- Do not apply standard high-phosphorus garden fertilizers.
- Do not prune back into bare, leafless wood.
What goes wrong with Allocasuarina
| Problem | What you'll see | What to do |
|---|---|---|
| Scale insects | Small, waxy bumps on the branchlets accompanied by sticky honeydew or black sooty mold. | Apply horticultural oil spray during the cooler months or manually scrape off minor infestations. |
| Aphids | Clusters of tiny soft-bodied insects on new growth, causing minor distortion of the branchlets. | Knock them off with a strong spray of water or apply insecticidal soap if populations are dense. |
| Spider mites | Fine webbing and stippling on the green branchlets, followed by localized yellowing. | Spray the foliage with a sharp stream of water to dislodge mites, or apply insecticidal soap in severe cases. |
| Root-knot nematodes | Stunted growth, wilting, and swelling or galls on the roots. | Avoid planting in known infested soils and maintain optimal plant vigor through proper watering. |
| Root rot | Yellowing cladodes, wilting, and rapid dieback caused by Phytophthora or Pythium in wet soils. | Improve soil drainage immediately and strictly avoid overwatering. |
| Powdery mildew | White, powdery fungal coating on branchlets in stagnant, high-humidity environments. | Prune nearby vegetation to increase air circulation around the canopy. |
| Phytophthora root rot | Yellowing of the branchlets, wilting, and rapid dieback of the canopy, often accompanied by rotting roots. | Ensure flawless drainage and avoid overwatering; infected plants must be removed as there is no effective cure. |
Making more Allocasuarina
Seed
- Collect mature, woody cones from female trees and place them in a paper bag in a warm location until they open to release the winged samaras.
- Sow the seeds shallowly in a well-draining seed-raising mix, covering them lightly with a thin layer of sand.
- Keep the medium consistently moist but not waterlogged, placing the tray in a warm, brightly lit position.
- Prick out the seedlings into individual pots once they are large enough to handle, and grow them on until ready for transplanting.
Allocasuarina questions
How many types of Allocasuarina are there?
The Sow catalog tracks 5 distinct Allocasuarina varieties. The most popular — ranked by 16 real gardeners — are shown first above.
What zones does Allocasuarina grow in?
Across its varieties, Allocasuarina covers USDA Zones 8–10. Individual varieties differ — each plant page lists its exact range, and Sow filters the catalog to your zone automatically.
When does Allocasuarina bloom?
Most Allocasuarina varieties bloom in fall, autumn, late winter. Staggering early, mid, and late varieties extends the genus's season in one bed.
Which Allocasuarina 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.