Syringa without flowers

Syringa without flowers

Question: syringa bloom

good morning,

I have two syringa plants in the garden that last spring had a wonderful bloom. This year, despite the lush vegetation, they only produced a few flowers. They were not pruned and I fertilized them in late winter. What could be the cause?


Syringa without flowers: Answer: syringa bloom

Dear Eliana,

Lilacs (syringa vulgaris) are shrubs or small trees, widespread in nature in Europe and Asia, typical of Italian gardens, as they are very easy to grow, and with a splendid flowering. To be able to flower these plants need to have a beautiful rich vegetation, and in the autumn months they must be able to have the perfect climate; otherwise they will prepare a few flower buds, and will tend to bloom little. It therefore happens very often that the spring flowering of lilacs is heavily influenced by the climate and the care they received in September or October. So if the autumn was too cold, or too hot, excessively dry, or characterized by very intense or persistent rains, your lilac will have prepared a few flowering buds, and what you have seen in the last few weeks is the result. In addition to this, it is likely that the very abundant flowering of last year has somehow "exhausted" the plant, which therefore this year proved to be lacking in flowers. If the plant is in any case well, it does not show any other kind of suffering, I believe that there is no problem due to pests or crop care. However, you did very well not to prune it: lilacs bloom on the wood of the previous year, which means that if we prune them in autumn or late winter, we will irreparably remove most of the flowering buds. Autumn fertilization is also excellent, but it is advisable to avoid a fertilizer that is very rich in nitrogen, because otherwise the production of many new green growths and few flowers is stimulated. Therefore, either manure or humus type fertilizer is supplied, which contain slow release nitrogen, which will be used again in spring; or a fertilizer that is fairly low in nitrogen and richer in phosphorus and potassium is supplied to stimulate the development of flowering buds and the root system. A good root system allows the shrubs in our garden to easily withstand any periods with excessive rain or, on the contrary, very drought. Do not worry and continue to care for your lilac as you always have, immediately after flowering sprinkle a slow release fertilizer for flowering plants under the canopy, and you will see that next year your lilac will bloom profusely.

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