Brachychiton Populneus Seeds, Kurrajong

Sowing **Brachychiton populneus** (kurrajong, or bottlebrush), a hardy ornamental tree valued for its dense foliage and broad trunk, is relatively simple if the seeds are well prepared. Here is a complete guide to successful sowing:

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### Materials needed:
- Seeds of **Brachychiton populneus**.
- Light, well-drained substrate (mixture of potting soil, sand or perlite).
- Seedling pots or trays.
- Spray bottle or watering can with low flow.
- Warm water for soaking.
- Mini greenhouse or transparent plastic bag (optional).

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### Steps for sowing:

#### 1. **Seed harvest and preparation**:
- The seeds are found in woody pods. When ripe, the pods split open to reveal seeds surrounded by irritating fibers.
- Wear gloves when handling the seeds and carefully remove these fibers.

#### 2. **Soaking the seeds**:
- Soak the seeds in warm water (about **30-40°C**) for **12 to 24 hours**. This helps soften the shell and improves germination.

#### 3. **Scarification (optional but recommended)**:
- If soaking has not been enough to soften the shell, lightly scarify the seeds by rubbing their surface with sandpaper or a file. Be careful not to damage the internal embryo.

#### 4. **Substrate preparation**:
- Mix seed starting soil with an equal part of sand or perlite to ensure good drainage.
- Fill your pots or seed trays with this mixture.

#### 5. **Sowing the seeds**:
- Plant the seeds at a depth of **1 to 2 cm**.
- Cover them lightly with a thin layer of sieved substrate.
- Tamp gently to ensure good contact between the seeds and the substrate.

#### 6. **Watering**:
- Moisten the substrate with a spray bottle or a watering can at low flow.
- Maintain constant humidity without soaking the soil.

#### 7. **Germination conditions**:
- Place the pots in a warm, bright place, but out of direct sunlight.
- The ideal temperature for germination is **25 to 30 °C**.
- If possible, cover the pots with a transparent plastic bag or place them in a mini greenhouse to retain humidity. Ventilate regularly to avoid mold.

#### 8. **Germination**:
- **Brachychiton populneus** seeds typically germinate in **2 to 6 weeks**, but this can vary depending on conditions.

#### 9. **Replanting**:
- When the seedlings reach about **10 cm** in height and develop several leaves, transplant them into individual pots.
- Use a similar substrate and continue to grow them in a bright but protected place.

#### 10. **Planting in open ground**:
- Transplant the young plants into their final location after **6 to 12 months**, when they are sufficiently robust.
- Choose a sunny location with well-drained soil.

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### Additional tips:
- **Exposure**: **Brachychiton populneus** prefers full sun.
- **Soil**: This tree tolerates a wide range of soils, including poor, clayey or calcareous soils, but it requires good drainage.
- **Watering**: Water moderately during the growth phase. Once established, it tolerates drought very well.
- **Hardiness**: Very hardy, it can withstand temperatures down to **-5 °C**. In colder climates, grow it in pots and protect it in winter.
- **Maintenance**: Prune lightly to promote a balanced shape. Remove weak or damaged branches.

With these steps, you will be able to successfully grow **Brachychiton populneus**, a majestic and resistant tree that will bring an ornamental and functional touch to your garden. 🌳✨