Question: cercis siliquastrum
hello to you experts. some time ago I sowed cercis seeds. after 2 weeks I germinated 5 out of 20 ... 1 I don't know xk but it has detached itself from the roots ... 2 they have germinated but then they broke and the last one is about 5 cm long but it collapsed on the ground but it continues to go on . what is going on???
Reply : redbud siliquastrum
there are many problems that occur during the development of small seedlings; the fact that not all the seeds of the cercis have sprouted may be due to the fact that not all of them were fertile, given that the plant produces so many, if they were all suitable for germinating, in a decade the cercis would have invaded most of the gardens where adult plants are present. To prevent this from happening, the cercis seeds are covered by a hard and rigid peel, in which it is difficult to let the water enter; It happens to those who try to sow them to find the seedlings sprouted several months after sowing.
So the fact that only a quarter of the seeds sprouted is not that strange.
The cultivation of very young trees, just sprouted from the seed, is then further complex; try to imagine the conditions of the seeds fallen in the ground next to the plant, these conditions are those that you have to reproduce around your seedbed. In general, cercis seeds are produced by the plant in the summer, some remain attached to the branches, others fall and remain in the damp and fresh soil of autumn for weeks. In spring some of these seeds begin to germinate, and are found outdoors, generally in a bright, but not excessively sunny area; this is because the cercis are grown in the sun, but at their feet there are grass seedlings, old leaves fallen from the tree, a series of things that slightly shade the seeds, and also the young plants.
So the seedbed should be kept in a bright, but half-shady area.
The other fundamental element is humidity: outdoors in spring, humidity is generally high, and rainfall is a very common atmospheric event.
In order to have a good success from a sowing, you usually start from a properly prepared and positioned seedbed.
First of all, fresh soil is used, lightened with sand; this soil is placed in a low, shallow seedbed and is watered with care, so that all the substrate is damp.
The seeds are placed there, without the need to bury them, and they are often vaporized, so as to maintain a "spring" climate around the plants.
It is often advisable to cover the seeds with vermiculite, it is a substance in granules, of a light color, which helps to keep the seeds in their place, slightly shading them and keeping the soil surface moist. In addition to this, the seedbed is often placed in a closed transparent plastic bag, in order to create a mini greenhouse, to prevent the humidity from evaporating.
When the plants are germinated they are easy prey for the low environmental humidity; in addition to this the positioning of the seedbed in an excessively dark place favors the development of seedlings with a strange elongated shape, very light in color.
If the seeds have been harvested in nature, or the soil used in the seedbed comes directly from the vegetable garden, or the seedbed itself has not been well cleaned before sowing, it often happens that fungi and mold develop in the soil, very harmful to young seedlings. . Small plants are also very susceptible to the presence of insects, which can quickly kill them.
Therefore, in general, clean seeds are used and immersed in a fungicide, new soil, not recycled, well cleaned seedbeds.