There are many factors that contribute to the failure of flower
bulbs to perennialize in the garden. First, The bulb may not be hardy in the
climatic zone. Second, the bulb size was reduced below the minimum required
for flowering. This size varies with the bulb species and cultivar. Some of
the factors affecting perennialization are as follows:
- Bulb species or cultivar was not adaptable to specific climatic
zone or microclimate.
- There was poor drainage in the planting site.
- pH greatly exceeded the 6 to 7 range.
- Site had high salt content and roots were burned.
- Bulbs were not properly fertilized to maintain or increase
- Site had improper light level for adequate photosynthesis
to take place.
- Large, shallow rooted trees were in the same site and the
tree roots were too competitive.
- Foliage was not allowed to senesce long enough for bulbs
to increase in size.
- Foliage was bent over and/or tied and inadequate photosynthesis
- Heavy freezing damage occurred.
- There were serious diseases.
- There was a prolonged drought that affected plant growth