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Roses are considered sensitive, which need a lot of attention and care to develop their full bloom. Also, the opinion, one must stay with the spray next to the rose to keep them healthy, is still widespread. But roses have changed a lot in the last few years as breeders are placing more and more emphasis on robust features. New varieties have been introduced, which are inherently less susceptible to the dreaded fungal diseases. The best of them are awarded the ADR title every year (adr-rose.de).
But with the choice of variety, it is not done yet. A bit of attention goes well even the most robust rose, and the classic fertilizers combined with fungicides are not the royal road. On the contrary, they can weaken the rose in the long term, because the natural conditions intervene. On the other hand, it is much more important to mobilize the natural powers of plants and to offer them ideal growth conditions. This begins in the soil, which can suffer greatly from regular weed removal, mineral fertilization and the entry of sprays.
There are many natural ways to strengthen roses, though no method can be equally effective for every variety and soil type. But the right measure, combined with good choice of varieties, gives hope for a flowering garden season in which the spray can safely stay in the shed.
Tips from the expert: So your roses stay healthy
Heiko Hübscher is well-versed as gardening director of the rose gardens Zweibrücken
How do you fertilize your roses?
We use normal commercial fertilizers and pay attention to the composition: Nitrogen less than 10%, Potash 6 to 7% and Phosphate only 3 to 4%. There is enough phosphate in the soil that can be mobilized by a soil activator.
Which products do you use additionally in the rose garden?
For example, we use Vitanal Rose Professional as well as sour / kombi, the rose active drops and the Oscorna Soil Activator.
Is the success really "measurable"?
Not every method has the same effect in every location and variety. We treat roses that need support, for example after frost damage. The results are positive due to the direct comparison with other locations.
Does that also apply to new crops?
All of these natural remedies can be given right from the start, with solids starting in April and castings starting in May. But normal fertilizer we give our roses until the second full bloom, so over a year after planting. Only then are roses stimulated to intensive rooting.