Paulownia 9501 Hybrid Roots

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Paulownia Hybrid 9501 – Premium Bare Root Cuttings (Grade A)

The Paulownia Hybrid 9501 is the original first-generation hybrid of the well-known 950x lineage, created from the cross Paulownia fortunei × Paulownia tomentosa. Selected for its impressive growth speed, straight trunk formation, and high productivity, it became the foundational hybrid that later inspired improved selections such as 9502 and 9503.

Recognised worldwide as a reliable and versatile hybrid, the 9501 performs exceptionally well across Europe, Asia, the United States, and Australia, making it one of the most widely cultivated Paulownia hybrids globally. Its robust genetic traits have made it a reference point for professional forestry, timber production, biomass programs, and large-scale ecological restoration projects.

Each root cutting provided by GreenSeed Paulownia is premium Grade A, selected for its structural integrity, vitality, and excellent rooting potential. Roots are conditioned for spring planting, ensuring reliable establishment and vigorous growth in a wide range of climates and soil conditions.

⭐ Key Characteristics

Foundational hybrid of the 950x line: the original first-generation cross that led to the development of improved hybrids like 9502 and 9503.
Fast annual growth: achieves 2–3 meters per year, capable of reaching trunk diameters of 40–50 cm within 7–10 years.
Strong cold resistance: tolerates winter temperatures down to –27 °C / –28 °C, making it suitable for hardiness zone 5.
High-quality timber: straight, lightweight, and stable wood ideal for veneer, plywood, biomass, biofuel production, and furniture manufacturing.
Wide adaptability: performs well in diverse climates across multiple continents, including Europe, Asia, the USA, and Australia.
Environmental contribution: high oxygen output and efficient CO₂ absorption support sustainable forestry and ecological restoration initiatives.
Proven reliability: trusted for decades by professional growers for large-scale plantations, commercial wood production, and biomass industries.

📊 Technical Specifications

Genus: Paulownia
Type: Hybrid (first generation)
Synonyms: Royal Treeme, Nordmax 21
Parentage: P. fortunei × P. tomentosa
Form: Bare root cutting
Grade: A
Average length: 10–18 cm
Diameter: 0.8–3.5 cm
Survival rate: 99 %
Growth rate: fast – 2–3 m/year
Mature height: 12–20 m
Crown spread: 9–15 m
Cold resistance: –27 to –28 °C
Soil requirements: well-drained clay, loam, or sandy soils; pH 4.5–7.5
Exposure: full sun to partial sun
Hardiness zones: 5–8
Primary applications: timber, veneer, biomass, biofuel, ecological reforestation
Delivery: bare roots carefully packed to preserve moisture, vitality, and structural quality during transport

🌿 Why Choose GreenSeed Paulownia?

Premium Grade A roots, freshly prepared and selected for maximum vigour
Original 9501 hybrid — the reference point for professional plantations worldwide
Secure packaging maintaining humidity and ensuring safe delivery
Expertise dedicated entirely to Paulownia hybrids and species
Trusted supplier for ecological, agricultural, and commercial reforestation projects

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.