Bulb strategies for continuous spring blooms

A timely roster of spring bulbs
Most spring bulbs are hardy to Zone 4, and even Zone 3. Hardiness does vary, though, so check the particular variety before you buy.

Early spring

• Glory of the snow (Chionodoxa spp. and cvs.)
• Crocus (Crocus spp. and cvs.)
• Winter aconite (Eranthis hyemalis and cvs.)
• Trout lily, dog tooth’s violet (Erythronium spp. and cvs.)
• Snowdrop (Galanthus spp. and cvs.)
• Hyacinth (Hyacinthus orientalis cvs.)
• Spring starflower (Ipheion uniflorum and cvs.)
• Dwarf spring iris (Iris danfordiae and I. reticulata cvs.)
• Summer snowflake (Leucojum aestivum and cvs.)
• Striped squill (Puschkinia scilloides)
• Siberian scilla (Scilla siberica and cvs.)
• Early species tulip (Tulipa pulchella, T. saxatilis, T. tarda, T. turkestanica and cvs.)

Mid-spring

• Ornamental onion (Allium spp. and cvs. such as A. karataviense and A. ‘Purple Sensation’)
• Camassia or quamash (Camassia spp. and cvs.)
• Fritillaria (Fritillaria spp. and cvs.)
• Grape hyacinth (Muscari spp. and cvs.)
• Daffodil (Narcissus spp. and cvs.)
• Tulip (Tulipa spp. and cvs.)

Late spring

• Ornamental onion (Allium giganteum and A. sphaerocephalon)
• Foxtail lily (Eremurus spp. and cvs.)