Bayer rose fertilizer, like any other commercial rose food, works well when used in the proper doses under good cultivation practices. Growing roses in containers presents a special set of requirements that, if not met, can make fertilizing as much of a problem as a solution. Common concerns are overfeeding, underwatering, buildup of fertilizer minerals and salts in the soil, excess nitrogen that impedes bloom, underfeeding and overwatering. Most can be corrected by fine-tuning both the general plant care, and Bayer fertilizer application rates, to suit your container-grown roses.
Built-Up Fertilizer Salts
Any fertilizer applied repeatedly in a closed environment, such as a container or garden pot, can build up in the surrounding soil. This can sometimes manifest itself in flaky white ecrustations on the soil surface or around the edge of the pot. A related problem is growing the roses in too small of a pot and there being insufficient soil around the roots to absorb the normal, recommended dosing of fertilizer, leading to unwanted buildup. Insufficient or infrequent watering exacerbates this problem by not washing the salts out through the soil regularly.
Underfeeding & Nutirent Deficiency
Roses are heavy feeders, and container-grown roses are watered more frequently than their ground-planted counterparts. This is particularly true for container roses grown in hot, dry climates. This combination of circumstances results in some of the applied fertilizer nutrients being washed through and out of the container soil too fast, resulting in underfeeding of your container-grown roses.
Excessive Foliage Growth with Diminshed Bloom
Too much nitrogen fertilizer buildup can drive excessive foliage growth at the expense of flower development. The rose plant will be vigorous but with no, or fewer, flowers, until the nitrogen levels in the soil can be brought down or the phosphorous levels brought up.