What Is Wrong With My Snow-In-Summer?

Are the seedlings dying and the stems are girdled or rotted at the soil line?

Are the roots dark brown, the plant is wilting, yellowing, and dying?

Do the leaves have spots or blotches?

Do the leaves have large, ragged holes in them?

The most likely cause for these symptoms is a damping-off disease. Remove and destroy all infected plants. To prevent damping-off let the soil surface dry between waterings, thin seedlings to avoid overcrowding, and do not add nitrogen fertilizers until plants have developed leaves.

These symptoms indicate a fungal disease - Pythium Root Rot. Do not overwater plants. Remove affected plants and their roots, and discard surrounding soil. Plant only in the pasteurized soil. Hold back on fertilizing too. Keep hose ends off the ground. Apply a copper-based fungicide to protect plants.

Your plant is suffering from a fungal leaf spot. These can come from several fungus diseases, causing spots to occur on foliage. Spots may enlarge rapidly, especially in wet weather. Destroy infected leaves or plants. Spray plants with sulfur to prevent the disease from spreading, especially if the weather is wet. Spray between rains. Prevent problems by thinning plants to provide good air circulation.

Large, ragged holes in the leaves are caused by slugs and snails. Slugs and snails feed on the plant leaves usually at night. To control slugs and snails use diatomaceous earth around your plants. You can also handpick them during the night or use shallow dishes filled with beer as a trap.

Mineral deficiencies can cause tip chlorosis or necrosis or cause foliage to discolor, fade, distort, or become spotted, sometimes in a characteristic pattern that can be recognized to identify the cause. When nutrient deficiencies occur, nitrogen and iron are the most commonly seen deficiencies. Apply only the mineral found to be deficient. Excess nutrients, on the other hand, cause symptoms like leaf tip dieback, marginal leaf chlorosis, necrosis (or burn), branch dieback, and pest problems. In this case, you should provide good drainage, and use good practices during fertilization and irrigation.