When will the paulownia be sown?

Paulownia is an introduced flower variety, which has pink, red, purple-blue, white, complex color and other colors, so when will it be sown?

When will the big paulownia be sown?

The best sowing time is spring and autumn, but if the environmental temperature is suitable, it can be sown all the year round. It takes about 22 ℃ to germinate, and the suitable growth temperature is 10-25 ℃.

It takes about 4-6 months from sowing to flowering, and if the temperature is right, it can germinate in 7-10 days, but the seeds are small, so sowing should not be too dense, if too dense germination should be carried out.

After sowing, the basin is soaked in shallow water and taken out, and the basin cover glass is placed in a semi-shaded place. In the seedling stage, avoid strong sunlight and proper shade, avoid the trend of sunlight, and often spray with water to maintain high humidity. When the seedlings grow 4 true leaves, they are planted in small pots. Apply thin cake fertilizer and water every 10 days or so.

Second, the propagation method of paulownia.

1. Score the ball

The 2-to 3-year-old corms after dormancy were first buried in the soil and watered thoroughly in autumn and kept at room temperature for 22 ℃. When the buds grew to about 0.5cm, the bulbs were dug up and cut into 2 to 4 pieces, each with a bud, and each piece was planted in a pot, that is, to form a new plant.

2. Sowing seeds

Soak the seeds for 24 hours before sowing to promote early germination, load the culture soil with rotten leaf soil, vegetable garden soil and fine sand in a shallow basin or wooden box, spread the seeds evenly after the soil is leveled, cover with glass after moistening the bottom of the basin, and emerge after about 10 days under the humidity of 18-20 ℃.

3. Leaf cutting

The leaves with strong growth and middle development were selected, together with the petiole, half of the leaves were cut off, and the petiole was obliquely inserted into the wet sand substrate, covered with glass and shaded, keeping room temperature 25 ℃ and high air humidity. 20 days after insertion, the base of petiole produced healing tissue.

4. Branch cutting

The method of branch propagation is commonly used in the propagation of paulownia. Twigs often sprout from the tubers, cut 2-3 cm long when cutting, insert them into fine sand or expanded perlite matrix, properly shade to avoid the trend of sunlight, maintain room temperature for 18-20 ℃, and root in 15 days.

5. Bud insertion

The bud insertion and propagation of paulownia is generally carried out when the new buds germinate up to 4 cm to 6 cm in spring. The extra new buds are broken off from the base, then inserted into the sand bed and maintained a certain humidity. After a period of cultivation, it can blossom from June to July of the following year.