Late summer and early fall are considered to be an ideal time for dividing hosta plants. Doing so in the summer months may afflict undesired effects on the plants' health.
Cut through the crown (upper branches and leaves) leaving 3 or more shoots per division. Use a sharp knife, and take care that you do not cut the roots. Depending on size, hostas can be split into several parts. To ensure each part has enough roots attached, to keep it alive, cut through the middle in symmetric parts.
While planting the division, it is better to keep the hole larger than the size of the division. Here, be careful while planting, lest the roots may get damage in the process. The divisions should be planted at a depth as that of the original plant. Remember not to plant them too high out of the ground, as it can inhibit growth.
After planting, carefully backfill and pack the soil tightly so as not to leave any room for air. Water the planted divisions and mulch (a protective covering of rotting vegetable matter spread to reduce evaporation and soil erosion) to help them conserve moisture.
Ensure that plants do not receive too much sunlight, especially at noon. Extreme heat may bleach the color and even result in scorched leaves. The same happens if left with less moisture. Varieties with blue leaves do best when grown in shade of landscape. Less light and cooler temperatures help them to retain their eye-catching blue color.
Keep a check on the administration of nitrogen fertilizer, as 125-square-foot bed of hostas wouldn't require more than one-eighth pound of actual nitrogen. Excess fertilizer results in foliage diseases and affects the variegated pattern of the plants.
Non-compacting mulch can be applied in early summer. This prevents weed growth, increase water retention and lessen soil compaction. Raking the mulch improves air movement through the soil. Keep watering for the mornings, so the mulch gets time to dry before evening. A winter mulch also protects newly-planted hostas, but should be removed before spring.
Splitting hostas, as said, is one effective and smart gardening tip for those who want to see their garden fuller and greener. Use these excellent ground cover plants to direct viewers' attention to your landscape features.