Bulb Planting Depth Calculator
Depth by Bulb Type
Get planting depth and spacing for common flower bulbs
Depth by Bulb Size
Calculate planting depth using the 3x bulb height rule
Formula
Depth = Bulb Height × 3 × Soil Modifier | Spacing ≈ 3 × Bulb Height
Frequently Asked Questions
How deep should I plant tulip bulbs?
Tulip bulbs should be planted 6-8 inches deep (measured from the base of the bulb to the surface). In colder zones, plant 1-2 inches deeper for extra cold protection.
What happens if bulbs are planted too shallow?
Bulbs planted too shallow may freeze in winter, sprout too early in spring, or produce weak stems. They may also be more susceptible to being dug up by squirrels.
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