Paulownia 9502 Hybrid Roots

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Paulownia Hybrid 9502 – Premium Bare Root Cuttings (Grade A)

The Paulownia Hybrid 9502 is an enhanced selection within the renowned 950x hybrid lineage, developed to deliver greater uniformity, superior timber quality, and improved plantation stability.
Created from the cross Paulownia fortunei × Paulownia tomentosa, this hybrid was designed specifically to outperform the earlier 9501 selection by offering more consistent growth, straighter trunk formation, and better overall productivity.

Recognised by professional growers and forestry specialists, the 9502 hybrid has earned its reputation as a highly reliable and stable performer, particularly valued in large-scale timber production, reforestation programs, and commercial planting projects that demand predictable results and homogeneous tree development.

Each bare root cutting supplied by GreenSeed Paulownia is premium Grade A, carefully selected for health, thickness, and rooting potential. Roots are conditioned for spring planting, ensuring excellent establishment and vigorous early growth, even in challenging climates.

⭐ Key Characteristics

Improved 9501 selection: refined genetics providing superior homogeneity and enhanced structural stability across plantations.
Uniform and predictable growth: ideal for large forestry operations requiring consistent trunk diameter and height development.
High-quality timber: produces denser, straighter, and more uniform wood, widely used for plywood, veneer, carpentry, and high-value furniture production.
Cold-resistant hybrid: tested to withstand –25 °C, making it reliable in a wide range of temperate climates.
Strong adaptability: thrives in well-drained soils and performs well under full sun exposure.
Professional-grade hybrid: valued for its consistency, reliability, and improved performance compared to earlier 950x selections such as 9501.
Excellent environmental performance: contributes significantly to CO₂ absorption and sustainable forestry objectives.

📊 Technical Specifications

Genus: Paulownia
Type: Hybrid (improved selection of the 9501 lineage)
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 and uniform — 2–3 m/year
Mature height: 15–20 m
Crown spread: 8–12 m
Primary applications: timber, veneer, plywood, furniture production, reforestation
Soil requirements: well-drained clay, loam, or sandy soils; pH 4.5–7.5
Exposure: ful

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.