Paulownia 9503 Hybrid Seeds

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The Paulownia Hybrid 9503, widely marketed under the name “Oxytree”, is an advanced selection of the 950x line. Developed from Paulownia fortunei × Paulownia tomentosa, it is valued for its rapid growth, cold resistance, and broad adaptability, performing successfully in temperate, subtropical, and tropical climates.

👉 Key Characteristics

Rapid growth: up to 3 m during the first year under optimal conditions.
Cold resistance: withstands temperatures down to –25 °C.
Climate adaptability: proven performance in temperate, subtropical, and tropical zones.
Improved selection: ensures stable performance and consistent timber production.
Environmental benefits: strong CO₂ absorption and contribution to sustainable forestry.

✔️ Excellent for professional plantations, ecological reforestation, and commercial timber production.
✔️ Recognized as a reliable hybrid in the 950x lineage, combining strength, adaptability, and productivity.

📊 Technical Specifications

Type: Hybrid (advanced selection of 950x line)
Commercial name: Oxytree
Parents: Paulownia fortunei × Paulownia tomentosa
Height: 12–20 m
Spread: 3–5 m
Growth rate: Fast (up to 3 m in the first year)
Cold resistance: –25 °C
Soil: Well-drained (clay, loam, sand), pH 4.5–7.5
Exposure: Full sun
Hardiness zones: 5–9
Main uses: Timber, veneer, furniture, biomass, reforestation

🌱 Paulownia Seed Sowing Guide

Practical, step-by-step instructions to germinate Paulownia from seed with high success.

🧰 Required Materials

Substrate: fine seed-starting mix, light and well-draining (optional: peat/coco + a bit of perlite)
Containers: seed trays, mini-greenhouse, or small pots
Watering: spray bottle or fine-rose watering can
Protection: clear lid, plastic wrap, or humidity dome
Thermometer: to keep 20–25 °C (68–77 °F)
Light source: bright windowsill or grow light if natural light is insufficient

1) Stratification (Cold Treatment)

Optional but recommended for better germination speed and uniformity.

Mix seeds with slightly moist substrate (peat, coco, or sand).
Place in a sealed bag or container.
Refrigerate at ≈ 4 °C (39 °F) for 4–12 weeks (1–3 months).

2) Sowing

Fill trays or pots with pre-moistened substrate (damp, not soggy).
Surface sow: scatter seeds on top—do not cover (they require light to germinate).
Mist gently with water.
Cover with a transparent lid or plastic wrap to maintain humidity (mini-greenhouse effect).

3) Germination Conditions

Temperature: 20–25 °C (68–77 °F)
Light: bright indirect light; avoid harsh direct sun
Timeframe: typically 10–20 days (sometimes longer)
Moisture: keep substrate evenly moist, never waterlogged

4) After Germination

Gradual aeration: once seedlings appear, open the cover slightly each day to reduce humidity and prevent damping-off.
Remove cover: when seedlings reach 1–2 true leaves.

5) Transplanting & Early Growth

Transplant at 10–15 cm (4–6 in) tall or at 2–3 true leaves if crowded.
Pot individually; keep in bright shade for 3–5 days, then increase sun exposure gradually.
Water regularly but moderately to avoid overwatering.