Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to force tulip bulbs in water [title] Trick the bulbs using a cold environment to make them flower. [step] Bulbs need to be' tricked' into believing they have survived winter in order to start flowering. This means they need to experience a sustained cold environment whilst they are dormant.

Ending1: [title] Plant some tulip bulbs in early spring to speed up flowering. [step] Tulips should still be planted in this area after the last spring frost, so make sure they are planted at least a day before the first frost. Ending2: To trick the bulbs you need to place a potted garden hose under the bulb in a tiny pot. Fill the pot about ¾ of the way with water and place the bulb (individually) so it is suspended by the hose. Ending3: [substeps] The ones you buy commercially are likely to have been chilled for you. If you are supplying your own bulbs, you'll need to recreate this cold environment yourself. Ending4: This is why you'll need a cold environment in which to propel them by forcing them. Use a lamp or light bulb and experiment before you choose one.

Answer format: ending1/ending2/ending3/ending4