Paulownia 9501 Hybrid Seeds

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Paulownia Hybrid 9501 is a first-generation hybrid created from Paulownia fortunei × Paulownia tomentosa. Selected for its fast growth, straight trunk, and high productivity, it became the foundation of the 950x line, later giving rise to improved hybrids such as 9502 and 9503.

👉 Key Characteristics

Rapid growth: 2–3 m per year, with trunks reaching 40–50 cm diameter within 7–10 years.
Cold resistance: withstands down to –27/–28 °C (hardiness zone 5).
Straight trunk & timber quality: ideal for veneer, plywood, biomass, biofuel, and furniture.
Strong adaptability: performs well across Europe, Asia, USA, and Australia.
Ecological benefits: high oxygen production and efficient CO₂ absorption, contributing to sustainable forestry.

✔️ Ideal for professional plantations, timber production, biomass and biofuel projects.
✔️ Reference hybrid in the 950x lineage, trusted worldwide by professional foresters.

📊 Technical Specifications

Type: Hybrid (first generation)
Synonyms: Royal Treeme, Nordmax 21
Parents: Paulownia fortunei × Paulownia tomentosa
Height: 12–20 m
Spread: 9–15 m
Growth rate: Fast (2–3 m/year)
Cold resistance: –27 to –28 °C
Soil: Well-drained clay, loam, or sand (pH 4.5–7.5)
Exposure: Full sun to partial sun
Hardiness zones: 5–8
Main uses: Timber, veneer, biomass, biofuel, 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.