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

Required Materials

Fine, sterile seed-starting mix (peat/coco + perlite), light and well-draining
Seed trays, small pots, or a mini-greenhouse
Fine mist sprayer or watering can with a soft rose
Clear lid, plastic film, or humidity dome
Thermometer or heat mat to maintain 20–25 °C (68–77 °F)
Bright growing area or horticultural LED light (PPFD 100–250 μmol/m²/s)

1) Stratification (Cold Treatment)

Optional but recommended to achieve uniform germination.

Mix the seeds with a slightly moist substrate (fine sand, vermiculite, or light seed mix).
Place the mixture in an airtight bag or sealed container.
Refrigerate at about 4 °C (39 °F) for 4–12 weeks.

2) Sowing

Fill containers with pre-moistened substrate (moist but not waterlogged).
Scatter the seeds on the surface — do not cover; they need light to germinate.
Mist gently with water.
Cover with a clear lid or humidity dome.
For large-scale production, use a misting chamber or heated propagation bench.

3) Germination Conditions

Temperature: 20–25 °C (68–77 °F), stable
Light: bright indirect light or LED grow lighting
Duration: usually 10–20 days
Substrate: always slightly moist, never waterlogged
Ventilation: avoid cold drafts but ensure minimal air exchange

4) After Germination (Critical Phase)

Open the lid slightly each day to reduce excess humidity.
Gradually increase ventilation to strengthen stems.
Remove the cover completely once seedlings have 1–2 true leaves.
Maintain strong light to prevent weak, elongated seedlings.

5) Transplanting & Early Growth

Transplant when seedlings reach 10–15 cm (4–6 in) or show 2–3 true leaves.
Use individual pots (7–10 cm) for optimal root development.
Keep plants in bright shade for 3–5 days after transplanting, then gradually expose them to full sun over 1–2 weeks.
Water moderately: avoid both drought and excess moisture.
Optional for production: apply a light, balanced fertilizer after 3–4 weeks (e.g. NPK 10-10-10).

PHASE 1 — POT CULTURE (UNDER COVER)

Objective: ensure maximum rooting success, protect plants from frost, and achieve uniform sprouting.

1) Rehydration (mandatory)

Before planting:

Soak the root cuttings in clean water for 5 minutes.
→ This reactivates the tissues and improves the success rate.

⚠️ Do not exceed 5 minutes.

2) Start Period

Early spring
Ideal temperature: 15–25 °C (59–77 °F)
Under a greenhouse, tunnel, or bright sheltered area

3) Pot Planting

Use individual pots for optimal root development and uniform emergence.

✔️ Root orientation

Place the thicker end upward (bud side).
Insert the root slightly angled (20–30°)
→ Promotes activation of the upper buds.

✔️ Covering

Cover the root with no more than 1 cm of substrate.
(Buds must remain close to the surface.)

4) Recommended Substrate

A heavy substrate slows down emergence. A light, airy mix ensures faster and stronger sprouting.

Use:

Fine horticultural potting mix
Light, well-draining substrate
Optional: perlite for extra aeration

‼️ Paulownia does not tolerate excess water.

5) Watering (pot phase)

Water moderately after planting.
Keep the substrate slightly and consistently moist.
Never waterlog the pot.
Avoid all standing water.

6) Sprout Emergence

Timing depends on temperature and conditions:

Sprouting usually occurs 3 to 8 weeks after planting.
Faster in warm and stable environments.

In case of cold weather or late frost:
→ Cover pots with frost protection fleece.

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