Bulbs should be planted at different depths depending on the size of the bulb. Depth is not to do with how early they flower or how tall they grow. Generally, spring bulbs should be planted 2-3 times as deep as the size of the bulb. That’s around 15-20cm deep for big bulbs like Fritillaria, large alliums, large tulips and hyacinths. Around 5-10cm deep for small bulbs like crocus, dwarf iris and chionodoxa. That is why when you are planting different types of bulbs in a pot, they are planted in l

John Rzeznik and Taylor Swift - Iris (Official Live Performance)