The Proper Conditions for Planting Bulbs: Depth, Timing & Soil

Timing by Bloom Season

• Spring bloomers (tulips, daffodils, crocus) – Plant autumn (Sept–Nov).
• Summer bloomers (lilies, dahlias, gladiolus) – Plant spring after frost.
• Autumn bloomers (colchicum, autumn crocus) – Plant late summer.

Depth & Spacing Rules

• Bulbs – Depth = 2× bulb height; space 3–4″ apart.
• Perennials (crowns) – Plant with crown at soil level; space 6″+ apart.

Soil Requirements

• Fertile, well-draining, pH 5.5–7.0.
• Amend acidic soil with lime; alkaline with sulfur.
• Raised beds or sand incorporation improve drainage.
• Avoid fresh manure or direct fertilizer contact (burns bulbs).
• Keep away from tree root zones (nutrient competition).

Container Planting

Half-fill pot with chosen media, place bulb flat, top up. Protect from overheating; move indoors once flowering starts. Water at planting; then only in extreme drought.

Aftercare

• Prune summer foliage after frost kills it.
• Remove dead evergreen branches.
• Most bulbs naturalize with minimal intervention.

Bottom Line

Follow depth, timing, and drainage basics, and bulbs reward you with reliable, increasing displays year after year—even in less-than-perfect soil.