Be sure the corms are upright. During the summer glads require a minimum of care. It is important to control weeds while plants are growing. Frequent, shallow cultivation is required, since deep cultivation may damage roots. This cultivation will also keep the soil loose and help plant growth.
Herbicides are available to control grasses in glads.
Mulching will help control weeds and reduce moisture loss. Provide enough water throughout the growing season. Lack of water may cause shorter spikes, smaller florets, and smaller corms for next season. Moisture availability is very important when flower spikes are beginning to form. At least one inch of water is needed each week for good growth, provided the water soaks in six to eight inches deep.