Bulb Planting Depth Rule: 3× Height, Plus Special Cases for Glads & Perennials

Universal Bulb Rule: Depth = 3 × Bulb Height

• 3″ tall bulb → plant 9″ deep.
• Applies to lilies, tulips, daffodils, hyacinths, etc.

Exceptions

• Gladiolus (corms): Flatter; plant **6″ deep** to prevent wind toppling.
• Sedum, Sundrops (perennials, not bulbs): Dig hole slightly larger/deeper than root ball; plant at same level as in pot. No "3×" rule.

Why Depth Matters

Deeper = more stable temps, better anchorage, less frost heave. Shallow = early emergence, freeze damage.