Paulownia 9503 Hybrid Roots

€69,90
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Paulownia Hybrid 9503 (Oxytree) – Premium Bare Root Cuttings (Grade A)

The Paulownia Hybrid 9503, commonly known under its commercial name “Oxytree”, is an advanced selection of the well-established 950x hybrid line. Created from the cross Paulownia fortunei × Paulownia tomentosa, this hybrid is engineered for rapid annual growth, strong cold resistance, and broad climate adaptability, making it suitable for a wide range of geographical regions — from temperate Europe to subtropical and tropical zones.

Renowned for its stability and uniformity, the 9503 hybrid is highly valued in professional plantations, biomass programs, timber production, and ecological reforestation. Its robust genetics, straight trunk formation, and consistent early-stage vigour make it a reliable choice for growers seeking fast results and dependable long-term performance.

Each root cutting provided by GreenSeed Paulownia is Grade A, carefully selected for thickness, vitality, and internal health. Roots are conditioned and prepared for spring planting, ensuring excellent establishment and vigorous early growth in a wide range of environments.

⭐ Key Characteristics

Advanced 950x lineage: improved hybrid selection designed for stable growth, strong vigour, and consistent timber quality.
Fast early-stage growth: reaches up to 3 meters during the first growing season under favourable conditions.
Cold-resistant: tolerates winter temperatures down to –25 °C, making it reliable in most European temperate climates.
Wide climate adaptability: performs successfully in temperate, subtropical, and tropical zones, offering flexibility for growers across different regions.
High-value timber: produces lightweight, straight-grained wood suitable for furniture, veneer, biomass, construction elements, and reforestation programs.
Environmental benefits: excellent CO₂ absorption and oxygen production — ideal for sustainable forestry and environmental restoration.
Reliable hybrid: recognized globally for its balance of strength, adaptability, and productivity, suitable for both small and large-scale planting projects.

📊 Technical Specifications

Genus: Paulownia
Type: Hybrid – advanced selection of the 950x line
Commercial name: Oxytree
Parentage: Paulownia fortunei × Paulownia tomentosa
Form: Bare root cutting
Grade: A
Average length: 10–18 cm
Diameter: 0.8–3.5 cm
Survival rate: 99 %
Growth rate: fast – up to 3 m during the first year
Mature height: 12–20 m
Spread: 3–5 m
Primary applications: timber, veneer, furniture, biomass, ecological reforestation
Soil requirements: well-drained soils (clay, loam, sand), pH 4.5–7.5
Exposure: full sun
Hardiness zones: 5–9
Cold tolerance: down to –25 °C
Delivery: bare roots carefully packed to preserve natural humidity and structural integrity during transport

🌿 Why Choose GreenSeed Paulownia?

Premium Grade A roots selected for optimal vigour and rooting potential
Fresh preparation and careful packing for every order
Verified hybrid line with proven results across Europe and international climates
Secure packaging ensuring maximum freshness and safe delivery
Specialised Paulownia supplier, offering reliable, high-performance hybrids for ecological and commercial 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.