How to grow tulips (Tulipa)

Although Tulip is a plastic culture, which can easily adapt almost all types of soil and climatic conditions, this flower grow best in sunny places, defended from strong winds. Later flowering sorts can grow in more shady places, where their flowering period is longer.
Before sowing sort the bulbs by size and remove those which are damaged or sick. You can disinfect them with proper preparation.
 Bulbs must be sown in beds during autumn (September-November for northern hemisphere). Larger bulbs are sown deeper than smaller one. There is one rule "sow bulbs 3 times deeper than its height'.Example if your bulb is 3cm high, you have to dig 10 cm hole for it. You can do the same with the distance between the flowers. It is good to cover the beds after sowing with tree leaves or pulp to prevent the bulbs from freezing.
 Tulips doesn't grow well in heavy, clay soils. In these cases it is good to add some sand to the soil. Soils with PH 6 or lower are inappropriatе. Best Ph is neutral between 6 and 6,5. Very sandy soils are also not good for this flower, in these cases you have to add some manure and clay. It is totally forbidden to add fresh manure because it will cause root rotting. If your soil is poor in nutrients you can add slowly dissolved fertilizers like bone flour. If you grow your Tulips in containers, you have to fertilize them more often because of the limited nutrient levels in the soil.
 During vegetation you must keep the soil moist and free of weeds. This will help the flowers to grow heigher and flower longer. After flowering keep the flower in the soil for a couple of weeks, until it starts to become yellow. During these period the plant is feeding its bulb. It is good to dig out the bulbs every year and sow them again in autumn, because with growing they go deeper and deeper and eventually one year they just won't come out. Storage bulbs in crates inside shady, cool and well ventilated places.