3, tulips can also be hydroponic, because hydroponic tulips are disposable bulbs, and the bulbs purchased must be treated at low temperature. Fill a vase or other container with water, put the seed ball into the mouth of the container, so that the seed ball is half submerged, and then put the hydroponic container in an environment of 7℃ to 10℃ to promote rooting. After the root system is formed, it takes about 15 to 20 days to move into indoor light. In the rooting stage, the growth temperature should be controlled at about 15-20 degrees because of the rapid consumption of water. Below 10 degree, the growth is relatively slow, but it has little effect on the growth; Above 25 degrees, it is easy to cause blindness.