This plant disease is caused by bacteria (Erwinia carotovora) that infect hyacinth bulbs both in storage and when planted in the ground. The bacteria initially penetrate and decay the upper portion of the bulb. The disease then progresses upward into the leaves and flower stalks, and down through the bulb and roots. The thick ooze that accompanies the decay is filled with millions of bacteria. Bulbs that are infected before they are planted will produce little, if any, growth. Even well-established, healthy plants may decay quite rapidly after they are infected, sometimes within three to five days. The bacteria survive in infected plant debris and bulbs, and are spread by contaminated insects and tools, and diseased bulbs and plants. Soft rot is favored by moist conditions. If bulbs freeze while they are in storage, they are especially susceptible to infection.
There is no cure for this disease. Remove and destroy all bulbs and plants showing signs of decay. Store bulbs in a dry, cool (40° to 45°F) location. Plant only healthy bulbs in well-drained soil. Do not overwater. (For instructions on proper watering, see About Watering.)
Plant Care for Hyacinthus