Bedding plants

Multiply black walnut - 2 possibilities in comparison


If you can't get enough of black walnuts, you can multiply a black walnut tree. Here's how we do it.

A black walnut (Juglans nigra) not only looks sublime because of its size and shape, but also provides rich harvests with tasty nuts after abundant growth. At the same time, it serves as a shade in summer and can be used for beautiful decorations and furniture with its wood. There are various reasons to create a black walnut tree and even to multiply it. But how does the propagation of a black walnut tree work - and what do you need for it?

Two ways to multiply the black walnut tree

There are many reasons to multiply a black walnut tree. For example, because you want to give away a young plant of this kind - or want to plant a second young tree in your own garden. If you have a larger, undeveloped plot of land available, you can also plant the black walnut more often in order to sell its wood later - because this is more expensive than many other types of wood. For many enthusiasts, the annual nut harvest from adult black walnut trees is also a very attractive argument for increasing existing stocks. But how exactly do you do this? There are generally two ways to propagate a black walnut tree.

  1. Either you use its fruit and seed, the black walnut itself
  2. or you can use it to multiply cuttingsthat can be found on the tree.

Black walnut propagate with cuttings

The multiplication of the walnut tree with the help of cuttings is considered to be much easier and faster than the multiplication by the black walnut of the tree. This is because seedlings have already germinated and grown and are therefore much more stable and robust, so that the hobby gardener does not have to start from the beginning, but saves some time, patience and effort.

In order to multiply the black walnut by cuttings, of course you need cuttings first. But where do you get them from? For this, look for young shoots on the black walnut tree that have grown at least 20 cm long, at best even more. Then you cut off the top of the shoots with a length of exactly 15 cm, so that a piece of it remains on the tree and can dry out - this protects the tree bark from harmful fungi. Even slightly woody shoots can be used well to multiply the black walnut tree - so you do not have to pay particular attention to the selection.

If you have decided on one or more cuttings, a planter is required, as well as suitable growing soil that is as nutritious as possible - because black walnut trees are known to prefer many nutrients for good growth. If necessary, several cuttings can be placed in the planter, which are then watered. Now lightly press the soil around the cutting. Cuttings like it warm and protected, should be allowed to stand in the indirect sun and be brought into the house or apartment for the first winter - only after about two years of growth are they themselves winter-proof. When the cuttings grow, waterlogging should be avoided, as it could damage the roots.

If new leaves appear on the cuttings of the black walnut tree, the shoot has been successfully tightened. This means that the cutting has taken root and receives enough nutrients to drive further growth and to become a black walnut tree that can later be planted in the garden. Until then, however, it will take a while, because the seedlings must first be separated, that is, given their own pot for growing with their own soil. The deeper this pot is, the deeper the root of the black walnut tree can spread - and the stronger the young plant gets before it is placed. Frost should be avoided when growing the cuttings - if they are to be planted with sufficient size and strength, the period from April to September is highly recommended. It is also advisable to support weak-looking seedlings with a stick or small post in the pot so that they do not buckle in the wind.

Advantages of propagating cuttings

  • germination time is avoided, saving time and effort
  • Cuttings are usually more robust and therefore grow faster
  • several cuttings can be grown at the same time
  • for starters, cuttings can share a pot
Disadvantages of multiplication

  • very nutrient-rich breeding soil is required
  • only works if there are cuttings

Black walnut propagate with nuts

If you want to grow one or more black walnut trees by collecting black walnuts, this is also possible - but it turns out to be significantly more difficult than growing them using seedlings that have already matured. To be able to note a success in growing black walnuts, you need fairly fresh black walnuts.

First of all, you need a flowerpot for each black walnut, which is filled with a mixture of very sandy soil and peat. The nut should then be completely removed from its shell before being placed in the ground. A light covering with a thin layer of soil should also be done. The ideal location for the pot is in a bright and slightly sunny place, but which is protected and where no frost or cold snap is expected in the near future.

Now it is important to keep the soil moist at all times - but to avoid waterlogging in any case, otherwise the nut could mold. Depending on the heat, the first small shoots will soon appear when germination is successful, which may only be implemented and separated when they have reached a height of at least 15 cm. Each seedling can now be given its own pot so that there is enough space for the roots to spread and that it also receives enough nutrients. Cultivation soil should continue to be used, if necessary it can also be mixed with a little compost.

The seedlings can be brought outside in spring and on warm days to adapt to the conditions. Sun is ideal to support the growth of young plants, but the root must never dry out - otherwise the plant will most likely die. In the first two years, however, it must be ensured that the plant is never exposed to frost - this would also cause the roots to die and the plant to no longer survive. The young plants should therefore be overwintered before they can be planted in the garden after the second winter in spring.

Advantages of multiplication with nuts

  • you don't need an existing black walnut tree
  • Collected black walnuts can be used if they have not dried out
  • one accompanies the plant from its beginnings and can see its properties
  • Disadvantages of multiplying with nuts

    • this type of breeding is not always successful
    • rearing takes longer
    • you need sandy and peaty soil