How to Grow Tulips in Water? The Complete Process from Bulb Preparation to Blooming

The tulip is a perennial herb of the genus Tulipa in the lily family, also known as the foreign lotus and the dry lotus, with rich flower colors and a blooming period mostly from March to May. It is also very suitable for water culture, especially bulbs that have undergone cold treatment, since the time from planting to blooming is short, the decorative effect is strong, and the operation is simple. In the 1970s, growers in Denmark and southern Sweden were the first to grow tulips in water; after the Dutch government issued its plant protection act in 1988, this technique got on the right track, and by early 2002 water-grown tulips already accounted for 40% of the Netherlands' total production. Below, both the methods for home water culture and for batch planting are explained clearly.

Home water culture: container, disinfection and water level are the key

Tulip bulbs are about 3 to 5 cm in diameter, so it is best to prepare a container that is narrow in the middle and wide at both ends, so that the bulb fits exactly in the center. You can buy a ready-made holder at a flower shop, or make one yourself: according to the bulb diameter, cut off the narrow neck at the top of a mineral water bottle and invert it into a wide-mouthed bottle, and a simple water culture container is ready.

Before water culture, first peel off the outer skin of the bulb and put it into a fungicide solution for disinfection, for example soaking it in a 600-fold dilution of chlorothalonil for 20 to 30 seconds; a solution of thiophanate or potassium permanganate also works. Wedge the disinfected bulb into the bottle neck, pour in clean water, and the water surface should just touch the basal plate: if it is too low and the basal plate cannot reach the water, that will not do, but if it covers the basal plate, rot easily occurs.

Regulate temperature and light in two steps: in the early stage, place the bulb in a 5 to 10°C environment to root, or wrap it in moist absorbent cotton and put it in the refrigerator crisper, keeping it at about 5°C; after 7 to 10 days, once good root development is confirmed, move it indoors at 15 to 18°C. Indoor light must be sufficient, otherwise it easily grows leggy. After seeing the pure white roots grow out, adjust the water level to submerge two-thirds of the root system, or switch to a nutrient solution rich in phosphorus and potassium fertilizer; change the water every 3 to 5 days depending on the temperature, and change to a dilute nutrient solution every two weeks, and flower buds will slowly emerge. It is recommended to choose dwarf varieties, as the plant shape from water culture is more beautiful.

Bulb selection and low-temperature cold treatment

Water-grown tulips cannot do without cold treatment: before the end of October, control the temperature at 9°C, then gradually lower it, and from December to January keep it at about 2°C with a humidity of 85% to 95%. Choose bulbs whose scales are tightly wrapped, undamaged, and harvested relatively late; otherwise problems such as shorter plants, reduced weight, yellowed roots, failure to bloom, or even bulb splitting easily occur.

Planting and care for batch water culture

For large-scale planting, use water culture trays: press the bulbs down onto the pins on the tray, and the pins should pierce around the bulb area, avoiding damage to the central flower bud; bulbs showing symptoms of infection must be removed, and water should be added to the tray immediately after planting.

During the rooting stage, place the tray in a rooting room at 5°C with a small amount of air movement, and replenish water in good time; you can use tap water or rainwater with an electrical conductivity of 1.5 ms/cm; for varieties prone to leaf splitting, water with an electrical conductivity of 2 ms/cm should be used during the rooting period instead.

When the roots grow to 4 cm, move the tray to a relatively flat ground surface in the greenhouse and remove diseased bulbs or those that have not sprouted. At this stage the water level should reach the overflow outlet, the temperature should be kept at 16 to 18°C, and the humidity maintained at 60% to 80%; at the end of the planting period, the number of waterings can be reduced to half of the previous amount, and giving sufficient water before harvest can also extend the blooming period.