April is best time to plant spring flower bulbs as the soil has cooled down sufficiently by this time.
Tulips are the one exception and are best planted in May.
A constant supply of water from planting time onwards, is the single biggest factor in ensuring success from spring flowering bulbs.
Water thoroughly after planting and there after twice a week until the bulbs go dormant in early summer.
Plant your bulbs according to the instructions on the pack in any ordinary garden soil the only condition is that it must drain well. Loosen the soil beforehand to a depth of 20cm and add some well decomposed manure, compost or leaf mould. A very sandy soil can be improved by digging in organic matter such as compost as well as water retaining polymers. A clay soil will benefit from the addition of some coarse sand and lots of organic matter to improve the texture.