How to grow Paulownia
Everything you need to succeed with Paulownia — from seeds and root cuttings to planting, watering, maintenance and harvest. The complete step-by-step guide.
Two ways to grow Paulownia
Paulownia can be grown from seed or from root cuttings. Each method suits different goals, budgets and experience levels. Here's how to choose.
From Seed
The most economical method, ideal for large quantities and pure species. Slower first-year growth and more genetic variability.
- Best for non-hybrid species (Tomentosa, Elongata, Fortunei)
- Low cost, high quantity
- Requires more time and care at germination
From Root Cuttings
The most reliable and widely used method. Faster establishment, true-to-type plants, available for all varieties including hybrids.
- All varieties (hybrids & non-hybrids)
- 70–95% success rate, identical to parent
- Faster first-year growth than seed
Growing Paulownia from seed
Paulownia seeds are tiny and need light to germinate. With the right conditions — warmth, humidity and surface sowing — you can expect a germination rate of 70–80%. Here is the complete process from sowing to planting out.
Optional stratification
Stratification is optional but strongly recommended for pure species. Place the seeds in a slightly damp medium in the fridge for 2–4 weeks before sowing. This raises germination by 20–40% and makes emergence more uniform.
Surface sowing
Fill seed trays with a fine, well-draining mix. Moisten it, then scatter the seeds on the surface — do not bury them, as Paulownia seeds need light to germinate. Press lightly for good contact.
Warmth & humidity
Cover with a clear lid or plastic to keep humidity high. Keep at 20–25°C in bright, indirect light. Mist regularly so the surface never dries out. Germination begins within 7 to 21 days.
Pricking out into plugs
When seedlings have 2–4 true leaves, transplant them gently into individual plugs or small pots. Handle them by the leaves, never the fragile stem.
Potting on & hardening off
Move into 1–2 L pots as they grow. Before planting outdoors, harden them off over 10–15 days by gradually exposing them to outdoor conditions.
- 1–3 weeks germination
- 4–6 weeks in plugs
- 2–4 weeks potting on
- 10–15 days hardening off
Autumn sowing is not advised for seedlings. Seed-grown plants don't have time to establish before winter. The ideal outdoor planting window is May–June, after the last frosts.
Growing from root cuttings
Root cuttings are the most efficient and widely used way to propagate Paulownia. A root segment of 10–12 cm contains enough energy reserves to produce a vigorous new plant — no rooting hormone or special substrate needed. Available for all varieties.
Respect the polarity
This is the key to success. A root cutting has a top and a bottom. The proximal cut (the end that was closest to the trunk) must point upward. Many growers make a straight cut on top and an angled cut on the bottom to tell them apart.
Plant at a 45° angle
Plant the cutting inclined at about 45°, with the top end (proximal) just at or slightly below the soil surface. In containers, leave the upper tip flush with the substrate.
Keep moist, not wet
Water lightly after planting and keep the substrate slightly moist. Excess water is the main cause of failure — it rots the cutting before it can shoot.
Wait for the first shoot
The first shoot appears 4 to 8 weeks after planting. If several shoots emerge from one cutting, keep only the strongest and remove the others to concentrate vigour.
Storing cuttings before planting: if you can't plant straight away, keep cuttings in slightly damp sand, frost-free, at 2–5°C. They keep for 2–4 weeks without losing vitality.
Soil & planting
Whatever method you choose, Paulownia has one non-negotiable requirement: good drainage. It tolerates poor soils but never waterlogging. Here's how to prepare the ground and the ideal container mix.
In open ground
Paulownia needs loose, aerated, well-drained soil. Heavy or waterlogged soil causes rot.
- Ideal soil: loamy to sandy, pH 5.5–7.5
- Loosen the soil 40–50 cm deep before planting
- Add coarse sand or mature compost if needed
- Avoid high water tables and waterlogged zones
In containers / nursery
For nursery or pot production, use a free-draining mix in pots of at least 1–2 L with drainage holes:
Spacing for plantations: for timber, plan according to your goal. In agroforestry, a spacing of 8–10 m lets Paulownia coexist with crops, cereals, vines or fruit trees while each tree develops a full canopy.
Watering & first weeks
The first weeks after planting are decisive. Regular watering supports root establishment. Once well-rooted (after about 2 years), Paulownia becomes notably more drought-tolerant.
🌱 Establishment phase (year 1–2)
Water regularly and deeply, especially in dry or warm climates. The goal is consistent moisture without waterlogging. Mulching around the base helps retain water and suppress weeds.
🌳 Established trees (year 2+)
Once the deep root system is in place, Paulownia tolerates drier periods well. In very dry climates, occasional deep watering during the growing season still benefits growth and timber quality.
In dry and semi-arid climates, regular irrigation during the first years is essential. Drip irrigation during establishment greatly improves survival and growth.
Maintenance & pruning
A little care in the first years pays off with a straight, vigorous trunk. Paulownia is also famous for one remarkable trait: it regrows from the stump after cutting.
The "cut back" technique (recépage)
For a perfectly straight trunk, many growers cut the young plant back to about 3 cm above ground at the end of the first season — only in frost-free conditions (above 2°C). The stump regrows in spring with a single, vigorous, straight stem.
Select a single stem
When several shoots emerge after cutting back, keep only the most vigorous one. This concentrates all the plant's energy into a single straight trunk.
Annual pruning (year 3+)
From the third year, remove low branches each year to build a clean trunk of 2–3 m. This is what produces high-value, knot-free timber.
Winter protection (first 2 years)
Below −5°C, protect the stump of young plants with dry leaves or a 20 cm mulch layer for the first two winters. Once established, Paulownia handles cold far better.
Frozen plant? It's not dead. Cut it back to 3 cm above ground (frost-free). The stump is alive and regrows with renewed vigour in spring. A Paulownia tree lives 60–100 years and the stump is nearly immortal — it regrows after each cut, allowing repeated harvest cycles without replanting.
Pests & diseases
Paulownia is generally robust. Good drainage, mulching and no autumn nitrogen prevent around 80% of problems. Here are the issues you might encounter and natural treatments.
Aphids (spring)
Treatment: black soap 20 ml/L, two sprays 7 days apart.
Powdery mildew (oidium)
Treatment: baking soda 10 g/L + soap, two applications in humid summer.
Root rot
Cause: soil too wet. Remove affected plants, improve drainage, replant on a mound.
Mole cricket
Treatment: cuts roots. Use water-pot traps around the plants.
Cockchafer larvae
Treatment: autumn tilling + Heterorhabditis nematodes in the soil.
Bacterial canker
Treatment: cut affected parts, disinfect with Bordeaux mixture.
Slugs (nursery)
Treatment: slug pellets around potted plants.
General prevention
The golden rule: drained soil + mulch + no autumn nitrogen = 80% of problems avoided.
Growing calendar
A month-by-month overview for temperate regions. Adjust to your local climate.
| Task | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Take / plant cuttings | • | • | • | |||||||||
| Sow seeds (indoors) | • | • | • | |||||||||
| Plant out | • | • | ||||||||||
| Watering (peak) | • | • | • | • | • | |||||||
| Summer care / pests | • | • | • | • | • | |||||||
| Cut back / prune | • | • | ||||||||||
| Winter protection | • | • | • | • |
Ready to start growing?
Choose your seeds, root cuttings or XL cuttings — every order ships with our practical growing guide to give you the best chance of success.