Should bulbs be refrigerated before planting?
Written by
Kiana Okafor
Reviewed by
Prof. Charles Hartman, Ph.D.Chilling bulbs in refrigeration before planting is significant for those in warmer climates (zones 8-10). Chilling causes bulbs to experience their winter dormancy, which they would normally undergo in cold regions. Adequate chilling facilitates the planting process for bulbs. Improper chilling causes bulbs to either produce weak blooms or fail to bloom at all. A proper refrigeration products require specific temperatures and times.
Adhere to correct refrigeration methods to avoid any damage. Light bulbs are best stored in paper bags to facilitate airflow. Avoid using plastic bags, as they can retain moisture. These bulbs should be kept away from ethylene-producing fruits, such as apples. Ethylene gas causes internal damage, which renders the flowering potential ineffective.
Preparation
- Select firm, disease-free bulbs for chilling
- Place bulbs in labeled paper bags with ventilation holes
- Set refrigerator to consistent 35-45°F (2-7°C)
- Designate bulb-only shelf away from produce
- Include humidity monitor to maintain 50-60% levels
Monitoring
- Check weekly for mold or dehydration signs
- Discard any softening bulbs immediately
- Rotate bags to ensure even temperature exposure
- Record start/end dates on calendar reminders
- Avoid frequent door opening to maintain temperature
Handle chilled bulbs slowly when initially exposing them to the outdoors. Acclimatize bulbs after refrigeration in a cool garage for a period of 3-5 days before planting to prevent temperature shock. Plant all bulbs immediately after acclimation. Water bulbs thoroughly after planting to reactivate root growth.
Common mistakes can often include overcrowding the refrigerator and failing to maintain consistent temperatures. I recently lost an entire batch of tulips because I stored them near a batch of bananas. Always check the temperature setting in your refrigerator. If there's a beverage refrigerator available, I encourage you to use it for optimal results.
Read the full article: When to Plant Bulbs for Spring Blooms
