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.
Fertilization can help produce large flowers.
Apply at one time or throughout the growing season. Two pounds of a well-balanced fertilizer per 100 square feet per year is recommended. If a single application is used, apply a slow release nitrogen type at planting time. Be sure to keep fertilizers away from corms to avoid damage to the plants. Make split applications at midseason and when flower spikes appear.