How to grow tulips? Detailed guide to planting in the ground and in pots

Tulips are long-day flowering plants that prefer sunny, sheltered spots and a climate that is warm and humid in winter and cool and dry in summer. They grow normally at temperatures above 8°C and generally tolerate low temperatures down to -14°C. They are very cold-hardy; in severely cold regions, if there is a thick covering of snow, the bulbs can overwinter in the open ground. However, they dislike intense summer heat: if summer arrives early and midsummer is very hot, the bulbs find it hard to get through the summer after going dormant. They require a slightly acidic sandy loam rich in humus, loose and fertile, with good drainage. Alkaline soil and continuous cropping are to be avoided.

Propagation methods for tulips

The main method is separating the small bulbs. In autumn, from September to October, the small bulbs are planted out separately. The mother bulb is annual, that is, it is renewed every year. After flowering, 1 to 3 new bulbs that can flower the following year and 2 to 6 small bulbs develop at the base of the bulb, and the mother bulb dries up. Within the scale leaves of the mother bulb, one new bulb and several daughter bulbs form. The number of daughter bulbs produced varies with the variety and is also related to the growing conditions. The swelling of the new bulb and daughter bulbs is usually completed within one month after flowering.

In early June, the dormant bulbs can be dug up, cleaned of soil and stored under dry, ventilated conditions at 20-22°C, which favors flower bud differentiation in the bulbs. The daughter bulbs separated from the large bulbs are stored in a ventilated place at 5-10°C, planted in autumn from September to October, and the planting site should be given sufficient leaf mold and an appropriate amount of phosphorus and potassium fertilizer as a base dressing. After planting the bulbs, cover with 5-7 cm of soil.

Sow in the open ground in autumn at a depth of 1-1.5 cm. The number of daughter bulbs produced within the scale leaves of the mother bulb varies with the variety and is also related to the growing conditions. They can sprout the following spring, but take four to five years to flower. The swelling of the new bulb and daughter bulbs is usually completed within one month after flowering.

How to grow tulips

Tulips can be planted in the ground or in pots. As for planting time, both methods can be carried out in late October. For ground planting, the spacing between plants and rows is 14-16 cm, with plenty of base fertilizer applied, a soil cover depth of about 4 cm, and a trench depth of 15-20 cm; water after planting. Around sprouting and flowering, apply 2 to 4 light feedings of fertilizer. For pot planting, choose plump, full-sized bulbs; a 30 cm flower pot can hold 3-5 bulbs. The top of the bulb should be level with the soil surface. After planting in autumn, bury the pot in the ground, dig it out again in spring, place it in a sunny, well-ventilated spot, and with normal watering and fertilizing it will flower on schedule.

Ground planting requires well-drained sandy soil with a pH of 6.6-7. Deeply plow and prepare the soil, using rotted cow manure and leaf mold as a base fertilizer, along with a small amount of phosphorus and potassium fertilizer, and plant in beds at a depth of 10-12 cm. Generally, topdressing is applied after emergence, at the flower bud formation stage and after flowering. The bulbs root in winter, and before flowering in spring, topdress twice. They flower from late March to early April, and in early June the above-ground leaves turn yellow and the plants enter dormancy. During growth, watering is generally unnecessary; just keep the soil moist, and water moderately in dry weather. The key points of its cultivation and management are basically the same as those for hyacinths; the only difference is that tulip varieties cross easily, which mixes up the varieties, so isolated planting should be practiced. Tulip bulbs contain a lot of starch and are easily eaten by mice during storage, so care should be taken in storing them.

Tulips are bulb plants that need to go through a certain low-temperature stage and only flower normally after the flower stem has grown fully. Conventional cultivation is the ordinary growing method, one in which the tulip bulbs have not been given cold treatment.

Tulip bulbs should be planted in deep, fertile sandy soil; their root growth hates waterlogging above all, so the site chosen must have smooth drainage. For the planting bed, the bed width is generally such that the trench depth is 30 cm; where the ground is level, the trench should be dug deeper. If the soil is rather clayey in the first year of planting, 2 cubic meters of peat and 5 kg of compound fertilizer per 100 sq m can be used as a base dressing to improve the soil. Tulips should not be continuously cropped; land where tulips have been grown in the previous one or two years is best not planted with them again. One month before planting tulips, the land should be deep-plowed and exposed to the sun to kill pathogen spores and remove weeds. Then, on a clear day, drench with a 100-fold dilution of 40% formalin (to a depth of more than 10 cm); after disinfecting the soil, cover with plastic film for about one week. After removing the film, break the soil up finely and get ready to plant.

Plant in sunny, well-drained sandy loam; generally, planting can be considered when the soil temperature is steadily below 12°C. After deep plowing, apply rotted cow manure and other phosphorus and potassium fertilizers (7-10 g of phosphorus pentoxide and 13-15 g of potassium oxide per sq m). The planting depth should be about twice the height of the bulb, and the spacing between plants and rows should be 2-3 times the horizontal diameter of the bulb. After covering with soil, do not water again, but cover with straw to raise soil moisture and prevent the soil from caking. Just before the young shoots emerge and unfurl their leaves, apply one light nitrogen feeding; after budding, increase the fertilizer concentration (10% fertilizer to 90% water). During growth, watering is generally unnecessary; just keep the soil moist. If the weather is dry, water thoroughly 1-2 times (to a moistening depth of about 15 cm). For use as cut flowers, cut when the flower buds have fully changed color; the vase life is about 10 days.

Before planting, the bulbs should be disinfected by soaking in potassium permanganate solution or formalin solution for 30 minutes, then dried and planted. For commercial planting, the density can be controlled at 12×12 cm or 13×12 cm, with slight differences depending on the variety. Generally, varieties with strong upright leaves and small plants can be planted somewhat more densely.

If planting for exhibition, the spacing can be 20-25 cm, and the planting depth is such that the top of the bulb is 4-5 cm below the soil surface. After planting, water thoroughly once to prevent drying out and dehydration. Tulips are mostly grown in pots for ornament, and also used as ground cover plants and for medicinal purposes.

Pest and disease control for tulips

1. Common diseases: The pathogens of tulip pests and diseases can be carried by the bulbs or by the soil and infect the bulbs. They mostly occur in hot, humid environments. The main diseases include stem rot, soft rot, color breaking, damping-off and blind buds, and the main pest is aphids.

2. Control methods: Carry out thorough soil disinfection before planting, use virus-free bulbs for cultivation wherever possible, promptly dig up and destroy diseased plants when found, and apply fungicide 1-2 times during greenhouse growth for better results; maintain good ventilation to prevent high temperature and high humidity; when aphids appear, spray with a 800-fold dilution of 3% natural pyrethrin.

How to grow potted tulips? Growing methods for potted tulips

Tulip flowers are gorgeous and loved by many people, and many have started growing potted tulips. So how should potted tulips be grown? Below is an introduction to the growing methods for potted tulips.

1. Choose the right variety and suitable bulbs

(1) Choose dwarf varieties

Not all tulip varieties are suitable for pot cultivation. In fact, it is best to choose genetically dwarf varieties or wild-type tulip varieties, because their stems are relatively short and their leaves compact. Dwarfing potted tulips can also be achieved by reducing the length of cold treatment or by using growth hormones such as chlormequat.

(2) Choose the correct bulb size

Potted tulips require high-quality, large-sized bulbs. This is because even if only one bulb in the pot fails to sprout, it will affect the cultivation result of the whole pot and make it a substandard product.

(3) Plan from bulb treatment to the flowering stage

After the bulbs are harvested, tulip bulbs need to go through a high-temperature treatment first, then a low-temperature treatment, so that they flower in early spring. Whether for potted tulip or cut flower production, these requirements must be met to flower early. This can be achieved through temperature treatment. During the heat treatment stage after bulb harvest, the leaves, flower stalk and flower (in that order) form within the bulb. Once the pistil has formed, the flower has formed, which means stage G has been reached. After stage G is reached, following a brief intermediate temperature treatment, bulbs intended for early flowering can be given cold treatment. For late-flowering bulbs, the heat treatment stage must be extended to delay the start of cold treatment.

2. Control the growth of potted tulips through proper cold treatment

(1) Pay attention to temperature

For wild-type or other dwarf varieties, the preparation for potted flower production is actually the same as for cut flower production. However, be careful not to give the bulbs too long a cold treatment, as this will make them grow too tall. For treating bulbs intended for early flowering, it is best to first give the dry bulbs a certain period of cold treatment, then pot them up two months before the bulbs are to be moved into the greenhouse, to complete the cold treatment.

Unrooted bulbs can be potted directly and complete their entire cold treatment. Bulbs with excessive roots can even be controlled with low temperatures after rooting. In early forcing, insufficient cold treatment can sometimes lead to blind flowers.

For tulips required to flower at Christmas, special varieties must be used and special treatment given.

(2) Handling bulbs after delivery

It is recommended to use bulbs that have already been treated. This avoids the need for storage and the risks that storage brings.

When they arrive, if the bulbs cannot yet be planted or have not finished treatment, they need to be stored in a dry, low-temperature building with moderate ventilation. The best approach is, when using bulbs that have already had partial cold treatment, to keep them at a low temperature of 5°C or 9°C. Untreated bulbs are stored at 17°C, and the environment must be dry with good air circulation, until the bulbs are planted or placed in cold storage to complete the required cold treatment at 9°C, 5°C or 2°C.

3. Use fresh potting soil and cover the bulbs

Mix suitable potting soil with a good ratio of water to air (at most 80% water and at least 10% air); pH 6 to 7; EC<1，且要新鲜（不含病原菌）。盆土常用的混合比例为60％的土壤+40％的泥炭，也可加15％的沙子。通常不必施肥。顶肥只用在那些容易出现水分外渗和茎中空的品种中。如出现此情况，在促成栽培时可使用顶肥0.5公斤/立方米或在移入温室后使用50克/平方米的硝酸钙。

Number of bulbs per pot: All types of plastic pots can be used for growing tulips. The number of bulbs planted per pot depends on the size of the pot. A 7 cm diameter pot holds one bulb; a 9 to 13 cm pot holds 3 to 5 bulbs. Most importantly, there must be at least 5 cm of soil below the base of the bulb for rooting and to provide the roots with suitable moisture and air. When planting, 2/3 of the bulb should be below the soil.

It is recommended to water before planting, and to water again after planting if there is not enough moisture.

4. Drawing up a production plan

A forcing plan can be drawn up based on the length of cold treatment required.

If potted tulips are to be sold throughout the winter, planting and moving into the greenhouse can be carried out every week. Sometimes all potted tulips receive a standard 14-week cold treatment, so that tulips can be planted and moved into the greenhouse every week. For the others, try to finish planting the tulip bulbs by November, then, when the shoots have grown long enough, temporarily place them in a rooting room with the temperature controlled at 1°C to -1°C.

The growing time in the greenhouse depends on the variety, the time of moving into the greenhouse and the greenhouse temperature. The greenhouse growing time gradually shortens as the season progresses, and also depends on when the product is to be sold.

The planting time depends on the desired flowering time. For plants hoped to flower around Christmas or January, planting must be early. Likewise, for plants hoped to flower late, the bulbs should be planted later.

For outdoor soil cultivation, the soil temperature determines the planting time. If a rooting room is used, since the temperature can be controlled, planting can be earlier. In some years, when growing outdoors, the soil temperature is too high; in this case, the cold treatment time is shortened and the risk of disease infection increases.

Trays holding the pots must be stacked so as to allow sufficient air movement. Keeping a distance of about 10 cm between the boxes and the wall will also appropriately increase air movement.

5. Watch the plants' development after moving into the greenhouse

(1) Moving into the greenhouse

When the cold treatment is completely finished, the potted tulips can be moved into the greenhouse. There must be enough light in the greenhouse to turn the shoots green. Once moved into the greenhouse, water carefully to keep them moist.

Keep the greenhouse temperature at 16°C to 20°C and the relative humidity at about 75%. Horizontal fans in the greenhouse can ensure an even greenhouse climate and stimulate plant transpiration.

The growing time in the greenhouse is 2 to 4 weeks, also depending on the length of cold treatment, the greenhouse temperature, the variety and the time of moving into the greenhouse (early or late).

(2) Controlling the height of potted tulips

Providing the minimum cold treatment time while keeping the light intensity in the greenhouse high can keep tulip plants short. If neither is possible (for example, in late forcing), growth regulators such as chlormequat can be used. For early forcing, the use of growth regulators is not recommended.

Prepare the chlormequat solution according to the product instructions, then spray it on. Growth regulators (including chlormequat) are prohibited in some countries. These chemicals remain in the soil for a very long time. Therefore, great care must be taken when reusing soil that has been treated with chlormequat.

The above is an introduction to the growing methods for potted tulips. Those who need it can follow these methods and, according to their actual conditions, grow the potted tulips they like.

Growing methods for potted tulips

Tulips are a very familiar potted flower. Tulips are very beautiful when in bloom, in a range of different colors, so many flower lovers grow tulips. Below, let us look at the everyday growing methods for potted tulips.

The potting soil should be a well-mixed preparation of 6 parts leaf mold, 3 parts sandy soil and 1 part rotted manure. A flower pot with a 20 cm diameter can hold 3 plants. From emergence onward, apply a light liquid fertilizer about once every 10 days, and add one application of phosphorus and potassium fertilizer from budding to before flowering. Keep the potting soil moist at all times and place it in a sunny spot for care.

Tulips like a warm winter and a cool summer, with an optimum growing temperature of 9-13°C. They are very cold-hardy and can withstand low temperatures of -35°C in winter. However, they dislike high temperatures; under cool conditions tulips not only have brighter flower colors but also a longer flowering period. If the temperature is too high, the flowers fade easily, which seriously affects their ornamental value.

Tulips like strong light, and light is an important limiting factor for their flowering. During cultivation, the plants should receive no less than 8 hours of direct sunlight each day. This helps tulips accumulate more photosynthetic products, which not only ensures good plant growth but also ensures normal flowering.

In controlling the flowering period of tulips, it is usually possible to give one topdressing each of a light liquid fertilizer rich in phosphorus and potassium when the plant has grown 2-3 leaves and after the flower scape has emerged; this is basically enough to ensure normal flowering in tulips. If growth is weak, some nitrogen fertilizer can be applied to promote vigorous growth in tulips.

After planting, water thoroughly so that the soil and bulbs are brought into close contact, which favors rooting. After sprouting, water should be appropriately reduced. When the leaves gradually extend, water can be sprayed on the leaves to increase air humidity. During the scape emergence and budding stages, sufficient moisture must be ensured to promote full development of the flowers. After flowering, watering needs to be appropriately reduced.

The main diseases of tulips include stem rot, soft rot, color breaking, damping-off and blind buds, and the main pest is aphids. Promptly dig up and destroy diseased plants and apply fungicide 1-2 times. At the same time, maintain good ventilation and avoid high temperature and high humidity. When aphids appear, spray with a 800-fold dilution of 3% natural pyrethrin.