Summer lilac can be increased so easily

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The summer lilac (Buddleja davidii) is undoubtedly one of the most popular flower shrubs in the garden - and is also extremely robust and easy to care for. It often shows the most beautiful flowers on rather barren, well-drained soils, and it also copes well with dryness. And best of all, its multiplication is so simple that it also usually succeeds gardeners in the first place! Here we introduce you to the possible propagation methods.

Step by step: propagation through cuttings

Cut shoot

Separate sections

Select shoot and cut (left). Remove lignified part of the shoot (right)

Cuttings propagation is the most common method - it is also practiced in nurseries. Starting from June to mid-August, the starting material is taken from the parent plant as flowless, not too soft shoot tips or shoot parts. Cut off a shoot that does not have flowers. This increases the chances that you will get vigorous seedlings. The cuttings you win from the non lignified part of the shoot. In addition to the head cuttings, you can cut several partial cuttings depending on the shoot length.

Cut sections

Remove leaves

After separating the sections (left), remove the lower leaves (on the right)

Starting from the top, separate finger-length sections. With summer lilac you do not have to cut directly under a pair of leaves, because it is well rooted even with a cut between the leaf pairs. Use your fingers to snap off the lower leaves that would otherwise be in the ground later. Leave two to three leaves at the top, which are cut in half to make better use of the space in the seed box.

Shorten leaves

Pot cuttings

The leaves are shortened (left). Then the cuttings are put in the pots provided (right)

Shorten the leaves with scissors by about half. How to reduce evaporation and space requirements of the cuttings. As a substrate, a nutrient-poor mixture of two parts Aussaaterde and one part sand has proven. Fill the earth into small clay pots (about 9 centimeters in diameter) and put in the cuttings.

Pour cuttings

Cover cuttings

Pour the cuttings well (left). Finally, the cuttings come under the hood (right)

For casting, it is best to use a small watering can for indoor plants. Then check if the cuttings are still firmly in the ground. With shashlik skewers you improvise a miniature greenhouse. Put three of the thin wooden sticks on the edge of the pot and put a transparent bag over it. Under the hood, the cuttings are protected from dehydration. But make sure that the foil does not touch the leaves, otherwise it will easily rot. The high humidity that develops underneath promotes rooting and prevents the cuttings from drying out. When fresh shoots show, the rooting has worked and the bag is removed. Tip: If you want to put the young plants in the garden bed later this year, you should protect them against frost damage in the first winter.

To multiply summer lilac by means of stick wood

At the end of the growing season, ie in the late autumn before the frost, cut vigorous annual shoots from the shrubs. Existing leaves are completely removed and the branches cut to 20 to 25 inches in length. Make sure that there is a bud or a pair of buds both at the beginning and at the end. So that you later know where the top and bottom are, you can cut the bottom slightly diagonally, the top straight.
The sticks are then immediately inserted into the ground. Prepare a sheltered, partially shaded corner in the garden by loosening the soil by digging it up, removing it from the weeds, and adding plenty of humus. The sticks are inserted with the correct side upwards at a distance of about 15 centimeters vertically into the ground, to the extent that at most a quarter of it looks out. Then sprinkle and keep moist. In winter, cover the bed with a fleece in the event of severe frost and check from time to time whether the stakes are still deep enough in the floor.
If you can not put the timbers right away, they will be hammered in, that is, put in bundles in a box or in the garden bed in a hollow and completely covered by moist sand. Another possibility: You pack the wood in a foil bag and put it in the fridge. In March / April, as soon as it remains frost-free at night, the bundles are dug up or taken out of the refrigerated compartment. Then put the cooled sticks in water for a day, then plug in as previously described.
As early as next spring, as soon as the soil warms, first roots begin to form. This is easy to recognize, even if new shoots appear.When they have reached a height of 20 centimeters, they are cut back to make the plants pretty bushy.

Sow summer lilac

Sometimes summer lilacs spread themselves by sowing. However, these offspring are not true to species, that is, they flower differently than the mother plant. Of course this can also lead to very exciting results! The situation is different with the alternate leaved summer lilac (Buddleja alternifolia), which as a pure species can be well propagated via seeds. In addition, the capsules are harvested in autumn, when they are brown-yellow discolored and dried. Sow the seeds, keep frost-free for the winter, but keep them cool, dark and dry, and sow them in sowing soil in March / April.
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Video Board: Gardening Tips : How to Care for Lilac Trees.

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