The Easter holiday falls on April 5th in 2015. Easter Sunday always falls on date ranging from March 22nd at the earliest to April 25th at the latest. Holidays from April 3rd to April 15th are considered mid-date for the purpose greenhouse forcing.
The arrival of cool temperatures reminds us that it won't be long before perennials will need covering for winter protection. Overwintering perennials for the first time? The process for successful overwintering begins with healthy plants.
Cool night temperatures, warm day temperatures and heavy dew are favorable for many foliar diseases including Bacterial leaf spot, caused by Pseudomonas cichorii on garden mums. Symptoms appear as black spots on foliage concentrated at the base of the plant. The spots often begin at the leaf margin but may also occur randomly. The spots are soft when tissue is wet and sunken and brittle when leaves dry. From the leaf, the bacterium can move through the petiole and into the stem resulting in a canker.
Monitor root health and test growing media of garden mums. Take random samples of plants out of their pots and examine roots carefully. The roots tell a lot about overall plant’s health, often before the top growth shows symptoms. Signs of poor root health are blackened or rotted roots or the lack of roots, especially young feeder roots. Diseased roots will not take up fertilizer.