Before the ground freezes in the fall, early bulbs can be planted most anywhere, except in the dense shade on the north side of buildings.
Ideally, plant crocus corms 6 to 8 weeks before a hard frost is expected and when soils are below 60 degrees F. This is usually during September and October in the North, and October and November in the South.
Make sure the soil drains well, because bulbs will rot in soggy ground.
Work in organic matter such as compost, peat or a substitute, such as shredded leaves to a depth of at least 10 inches.
Plant crocus bulbs 3 to 4 inches deep (with the pointy end up). After planting, water well.
Plant bulbs in groups or clusters rather than spacing them in a single line along a walkway or border. Single flowers get lost in the landscape.Plant a few inches apart, and plant in groups of 10 or more.
Consider planting crocuses in lawns and meadows where they can form carpets, or mass them in the front of flower beds along the edge.
Plant taller bulbs and spring-flowering shrubs behind the early bulbs for color contrast.
Care
Apply a balanced fertilizer in early autumn if your spring is short and the days heat up fast; or, apply fertilizer after bulbs flower if your spring is long and temperate; bulbs will have a chance to use the extra nutrients to produce bigger carbohydrate stores.
Through the autumn, keep crocus beds watered if weather gets dry but do not waterlog. Cover the beds with mulch before the winter.
In late February, remove mulches from snowdrops and crocuses so the shoots can come through.
In February and March, keep plastic milk jugs or other coverings on hand to protect the flowers of crocuses and other early bloomers against the return of severe weather.
If you have crocuses growing in your lawn in mid-Spring, don't mow until their leaves have died down.
Pests
Mice, voles, and squirrels may feed on the corms. If they are a problem, consider planting crocus bulbs in buried wire cages.
Birds sometimes pick off the flowers.
Corms in storage are prone to rots and molds.
Recommended Varieties
'Bowles White' produces white flowers with deep golden yellow throats in early spring. It grows 2 to 3 inches tall.
'Flower Record' has single pale violet flowers in spring to early summer. It grows 4 to 5 inches tall.
'Pickwick' is a striped crocus with alternating pale and dark lilac and dark purple bases. It's 4 to 5 inches tall and blooms in spring to early summer.
'Tricolor Crocus' is a beauty. Each narrow flower has three distinct bands of lilac, white, and golden yellow. It grows 3 inches tall and blooms in late winter and early spring.
'Purpureus Grandiflorus' has abundance violet flowers with purple bases. It grows 4 to 5 inches tall and blooms spring to early summer. Read More :
