What depth and spacing work best for tulips?

Proper depth and spacing are more important to the success of tulips than anything else. The 3x bulb height rule is essential to the growth of this flower. This is the principle of digging holes 3 times the bulb height. Correctly placing the bulbs will also prevent frost damage to them and the leaning and falling of the stems. I measure the height of each bulb before planting it to ensure I know the required depth.

Spacing affects air circulation and access to nourishment for the plants. Too close together, the bulbs compete for nourishment and invite disease due to a lack of air circulation. In the garden, plant 4-6 inches apart. In containers, use 1-2 inch spacing. I mark positions with sand before planting, to help with even distribution.

Seasonal shifts necessitate adjustments. In winter frost areas, plant 1 inch deeper for added insulation. Warm climates have much shallower planting, so you don't get overheated. I always adjust the depths for my local frost patterns each year.

Recognize when you are planting at the wrong depth, and planting too shallow causes early sprouting and frost damage. Planting too deeply may delay or prevent blooming. Adjust next season if you find a weakness in the stems or fail to have blooming flowers. My planting diary is helpful as I keep records of the things that do the best.

Read the full article: How to Plant Tulips Step by Step