Planting and Propagation Daylilies are very hardy and can be planted almost any time the soil can be worked. They grow best in a well-drained, slightly acidic soil but are able to grow under both dry and wet conditions. In a new flowerbed, poor soil should be amended with six inches of compost and worked in to a depth of 12 to 18 inches. Prior to planting, a soil test will determine if additional nutrients are required. If needed, fertilizer should be incorporated with the compost.
Plant daylilies so the crown is level with the soil or no more than one inch below it.
The planting hole should be larger than the spread of the root mass. Set the plant on a mound in the middle of the hole and spread the roots out in all directions. As with many landscape plants, daylilies should be planted in masses to create a bold impact. At minimum, three of a single daylily cultivar should be planted together. A larger number of smaller cultivars may be needed to get a similar impact.