Climatic requirements of roses – Air – Insolation.
Air. You can find the claim in many specialist publications, that roses require a clean one to thrive, air not polluted by industry and motorization. However, this claim is unfounded. It follows from many national observations, that roses are extremely resistant to any air pollution. Many examples could be given to prove this, e.g.. from the Łódź area, where large amounts of roses can be found both in public green areas, as well as in nurseries and gardens, leaves nothing to be desired in terms of health and strength of growth. So the warnings in this regard are certainly exaggerated. It is understandable, that in such unfavorable conditions breeds and varieties that are naturally more resistant will do better. This is important mainly for mass planting in urban green areas; in industrial centers, varieties with naturally healthy and resistant foliage should be planted.
Insolation. On this point, scientists and practitioners agree: roses feel best in open positions, solar panels. This mainly applies to cultivation on a commercial scale; in small amateur gardens it is possible to plant roses in slightly shaded positions. However, there can be no question of growing roses in the shade; in such stands the roses will not be successful. It must also be emphasized, that the unhampered access of air to the bushes is of great importance. Roses in open positions develop healthier than in sheltered positions, because they feel better there, where the air has conditions to be continuous, unrestrained movement. In nurseries in such open positions, winds may occur in strong winds, especially in the mesh material on R.. multijlora, but the benefit of such positions, thus getting well-grown, healthy material - compensates for losses caused by wind.
It follows from the above comments, that roses basically do not require covers. However, covers may prove to be beneficial in nurseries for the production of shrubs meshed on R.. multiflora and planted in positions extremely exposed to winds, and also in cut flower shrub plantations, where they cause flowering earlier, which in this case is very important. Therefore, when assessing a position under the pink one must consider all circumstances, and then only decide, or in the data, specific microclimatic conditions, cultivation in completely open ground will be more advantageous, or in a sheltered area. In the latter case, the costs of equipping such shields must be taken into account, which can only be amortized with cultivation carried out for many years.