Food products in which they are used include beverages, frozen dairy desserts, sweets, baked goods, gelatins, and puddings. Reported use levels are generally below 2 ppm and are thus in minute quantity. The damask rose enjoys heat, water, and high fertility, and under these conditions it flowers well. Adequate water is essential throughout the vegetative and flowering periods, and where irrigation is needed, basal watering, such as drippers, are favoured as they avoid wetting the flowers at harvest time. The frequency of watering depends on the porosity of the soil and the seasonal weather conditions.
Roses are gross feeders and enjoy high fertility conditions.
Fertilisers containing nitrogen, phosphorus, sulphur and potassium are needed for high flower production, and the chosen fertiliser dressing should relate to soil analysis. Annual soil tests will aid future decisions for fertiliser and lime needs. In general, roses are grown on rootstocks to improve their vigour and flower production. Rosa damascena 'Trigintipetala' will grow from cuttings, but overseas trials have shown that flower production is lower than from plants grown on rootstocks. The production block of Trigintipetala at Redbank was established with plants budded on R. multiflora stock.