Different from other tree species, the seed of Alsophila spinulosa will fall to the ground when it matures, and its cone can be hung on the tree all winter without falling off. Therefore, before the next spring comes, you can pick the fruit balls, put them in sacks, and then gently beat the sacks with wooden sticks to break all the fruit balls, so that all the seeds will be played out.
However, fluff often adheres to the seeds of paulownia, and these fluff and seeds must be peeled off to obtain pure seeds, otherwise the attachment of these fluff will keep the seeds from contacting the soil.
Extended data:
The best planting time is March in spring, and the root system should be no less than 10~ 12 times of DBH. For big seedlings with DBH above 5cm, in order to ensure survival and reduce transpiration, before planting, the stem can be fixed at a height of 3~3.5m, and all the branches on it can be smoothed.
Apply antiseptic to the incision, and use white ready mixed paint or lime milk. Immediately after planting, water 1 time, then water 1 time every 7 days, thoroughly water for 3-4 times continuously, and then cultivate and loosen the soil.
Platanus acerifolia has straight trunks and branches, and usually has a wide natural crown. When making street trees, the shape is generally cup-shaped. If there is no overhead line on it, you can be happy. When making shade trees, they are mainly naturally straight or multi-branched.