How to Grow Crinum - Planting & Caring

By Sharon & Team   /   Grassy Category   /   2023

Crinum, commonly known as spider lily or swamp lily, is a genus of about 180 species of perennial flowering plants native to tropical and subtropical regions of Africa, Asia, Australasia and the Americas. The genus includes a number of ornamental plants, such as C. asiaticum, which is widely cultivated as a houseplant, and C. x powellii, a popular garden plant.

How to Grow Crinum - Planting & Caring

Growing Easiness

Is it easy to grow Crinum plant? Although the plant is easy to take care, it has some small difficulties. The plant does not like to have its leaves wet, so gardeners have to be careful when watering it. The other small difficulty is that the plant is poisonous, so gardeners have to be careful when handling it.

Plant Size

How big can it be? Since the plant reproduces by offsets, the number of bulbs in one place can be very large - up to 100 or more. The bulb is located at a depth of 30-80 cm, and its diameter in old specimens can reach 20-25 cm. The height of the flower stem can also be up to 1 m.

Growth Rate

How fast is the growth? If you want your Crinum to really thrive, give it some room to grow. These are not small plants; even the miniature varieties can get quite large. Most will reach at least 3 feet in height, with some growing as tall as 6 feet. As far as width is concerned, 2 to 3 feet is average.

Crinum Basic Knowledge

Plant Form Grassy Onion
Family Amarillidaceae
Origin South Africa, tropical America

Lifespan, Perennial or Annuals

How long is the lifespan? While the Crinum bulb is not the longest-lived of all plants, with proper care it can exist for many years. If you have the right conditions and give the plant the care it needs, your Crinum could theoretically outlive you. The plant is native to Africa, and in the wild it can live for over 100 years. Bulbs that are grown in captivity, however, will typically only live for about 20 years. If you want your Crinum to have the longest possible lifespan, you will need to provide it with the right conditions and care.

Ideal Temperature

What is the ideal temperature? If you want to keep your Crinum plant healthy, you need to know the ideal temperature range for it to thrive. In the summer, the ideal temperature range is 68-77 degrees Fahrenheit. However, during the winter (or rest period), the ideal range is 50-59 degrees Fahrenheit. Keep in mind that Crinum plants are not suitable for growing in hot, humid environments.


What about the humidity? Sometimes, the Crinum plant needs a little help to stay hydrated. The leaves will start to curl and the plant will start to look unhealthy. If you see this happening, it's time to give your Crinum a good drink. The best way to water a Crinum is to use a spray bottle. This will help to evenly distribute the water and prevent the leaves from getting too wet.

Light Requirement

What amount of light this plant needed? While this plant prefers bright diffused light for 3-4 hours each day, it will also do well under artificial lighting. The best place to put this plant is near a western, eastern, or southern window that has some shading.

Soil Composition

What is good soil for Crinum? So, the best potting mix for crinum lily is the one that is fertile, drains well, and is loose. A mix of 3 parts sod land, 3 parts leaf land, and 1 part of coarse sand or perlite is ideal. This type of mix will ensure that the crinum lily gets the nutrients it needs while also having good drainage.

Watering Time

How much I must water Crinum? The Crinum plant should be watered abundantly with lukewarm water. The soil should not dry out between watering, but the plant should not also stand in water. By the autumn, watering is reduced, but complete drying of the soil is prevented. In winter, watering should be such that the substrate does not dry completely.

Fertilizing and Nutritient

About fertilizer. The Crinum plant is a flowering plant that is native to Africa, Asia, and Australia. The plant is known for its large, white flowers that have a strong fragrance. The leaves of the Crinum plant are long and strap-like, and the plant can grow to be up to six feet tall. The Crinum plant is a popular choice for gardens and landscaping because it is easy to care for and is tolerant of a wide range of soils and climates. When it comes to fertilizing the Crinum plant, it is important to use a fertilizer that is high in potassium. Potassium is an essential nutrient for the Crinum plant, and it helps to promote strong growth and large, vibrant flowers. A liquid fertilizer with a high potassium content should be applied to the soil around the Crinum plant every three to four weeks during the growing season.


How to reproduce Crinum? Unless you purchase a plant that is already blooming size, you'll need to wait a few years for your Crinum lily to bloom. These bulbs are best planted in the fall, and they will reward you with years of beautiful blooms if you take care of them properly. Crinum lily bulbs are large, so plant them about 6 inches deep in a well-drained soil mix. They like full sun to partial shade and plenty of room to grow, so plant them about 18 inches apart. Water your Crinum lily bulbs regularly during the growing season, but be sure to allow the soil to dry out somewhat between watering. Fertilize your plants monthly with a balanced fertilizer during the growing season.


Why Crinum won't bloom? Common crinum lily will bloom in late summer to early autumn. The flowers are white, pink or red, and have a faint, sweet fragrance. If you move the plant indoors during the winter months, you can get the crinum lily to bloom year-round. These plants can also be grown in water, with the roots in a hydroponic solution. To prolong blooming, remove the faded flowers.

Transfer or Repotting

How much I must water Crinum? Although the plant is unpretentious, it is necessary to transplant it every 2-3 years. The best time for this is March, before the onset of growth. Transplantation is necessary in a close pot with a diameter of 25-30 cm. The bulb is buried in half or 2/3 in the soil. You can replace only the top layer of the soil every year.

Caring The Crinum

How to care the plant? The Crinum can be planted in the garden in spring or early summer. They should be planted to a depth of 25-30 cm in March-April. The plant does not like drafts and needs a rest period to form flower buds. Crinum for the winter do not usually shed their leaves, but their number is slightly reduced, the plant goes into dormancy.

Pests & Challenges

What is the challenge when caring Crinum plant? Common problems when growing include pests, fungal diseases, and bulbs rotting. Also, the plant may not flower due to insufficient nutrition or light. Watering problems, both too much or too little, can also cause the plant to have insufficient or no flowering. Foliar burn, characterized by red longitudinal spots on the leaves, can also occur from too much or too little watering.

Toxic & Poisonous Type

Are Crinum poisonous? When all parts of the plant are ingested, it can be fatal. The Crinum plant is a beautiful flowering plant that is often used as a decorative item in homes and gardens. However, the plant is actually quite toxic. If any part of the plant is ingested, it can be fatal. The plant contains a poison called crinoidine which can cause paralysis, respiratory failure, and death. If you have a Crinum plant in your home, it is important to keep it out of reach of children and pets.