Contents
Crown of thorns or euphorbia is an annual flowering plant in the family Euphorbiaceae. Gardeners grow some of these varieties as ornamental houseplants. These plants are native to North America, South Africa, and Madagascar countries. Thorn plants are grown as landscape because of its drought and heat tolerant properties. The Plant has poisonous milky white sap with floral structures of flower heads. Flowers do not have petals and sepals like other flowering plants. Roots are thick, fleshy and tuberous. Leaves are arranged alternately and appear in whorls.
Here in this article, we shared the detailed information about euphorbias or crown of thorns which is used as the air-purifying plant and as ornamental plants to decor your home.
These plant leaves turn yellow, root rot and pests & disease problem. It is mainly due to the lack of caring for the euphorbia plants. We come up with a solution to these sort of problems and you can know them detailed in this article.
There are more than 2000 varieties cultivated worldwide for its ornamental purposes and fragrant flowers. Many of these plant species are succulent, thorny and grow well in tropical & sub-tropical regions of warm temperatures.
| S. No | Plant Variety |
| 1 | Euphoriba Milii Bevilaniensis |
| 2 | Euphoriba Milii Hislopii |
| 3 | Euphoriba Milii Imperatae |
| 4 | Euphoriba Milii Longifolia |
| 5 | Euphoriba Milii Roseana |
| 6 | Euphoriba Milii Tenuispina |
| 7 | Euphoriba Milii Vulcanii |
Euphorbia plants are popular houseplants of your garden. These plants may vary in hardy temperate zones. Here is the step by step procedure to grow crown of thorns starting from seeds.
Crown of Thorn Plant Information
Family : Spurge
Scientific Name : Euphorbia milii
Origin : Madagascar
Soil : Well-drain fertile soil with 6-7.5
USDA Zone : 8-11
Sunlight : Full sun to partial shade
Temperature : 60-90F
Plant Height : 5-6 feet
Flowers : Red, pink, white, yellow
Fertilizers : N-P-K fertilizer, Baking soda
Harvesting Time : 1-2 years
Select a silver leaf seed variety that is well suited to grow in a sunny location. Euphorbia myrsinites and euphorbia rigida varieties are good to grow to start from seeds. Variegated Euphorbia looks best in bright places if they grow in warmer climates.
Choose a pot of size 6-8 inches tall to start growing from seeds. The pot is made up of clay or ceramic and has holes at the bottom to drain water completely.
Euphorbia plants are tolerant to low-quality soils and usually prefer well-drain soil so that the air can circulate within the roots. Either you can prepare soil or buy from a nursery store containing 2 parts soil and 1 part peat moss, sand, and perlite.
Provide them light moisture by supplying sufficient amount of water to the plants. It helps to prevent the powdery mildew disease when watered under the plant roots.
Euphorbia plants thrive quickly when the room temperature is between 65-75F. These plants can withstand if the temperature is below 50F in winter season and 90F in the summer season. Seeds germinate slowly and may take 2-3 weeks to month time. These plants do not like disturbing the roots so the best place to grow them pots.
| S. No | Element | Deficiency symptom |
| 1 | Nitrogen | Yellowish green leaves, curled, wrinkled |
| 2 | Phosphorus | Light green color leaves and dried petals |
| 3 | Potassium | Dark green and erected leaves |
| 4 | Magnesium | Yellow leaves, interveinal chlorosis |
| Pests | Diseases |
| Mealybugs | Powdery mildew |
| Spider mites | Root rot |
| Aphids | Damping off |
| Thrips | Tobacco mosaic virus |
| Caterpillars | Leaf yellowing |
| Nematodes | Fusarium wilt |
It is the process in which pollens are transferred from stamen to stigma through wind and insects like honey bees, hummingbird, and beetles. Pollination in euphorbias can be achieved by using a brush with fine hair and transferring the ripe pollen.
To keep the crown of thorns plants to the ground level, cut back the branches while leaving the auxiliary buds and sprouts. Remove dead leaves and flowers from the surface of the soil. This will help the soil to aerate and prevent from fungal diseases.
Thorn plants remain healthy even though you do not fertilize the plant occasionally. Watering too much helps to dissipate chlorine from the soil. So as to improve the soil fertility and flower blooming use a balanced fertilizer N-P-K in the ratio for 10-10-10. If you don’t find an NPK fertilizer then you can use organic compost, manure and Baking soda for better growth of euphorbias. Apply the fertilizers once in a week during the growing season around the base of the plant, where weather begins to cool and days become shorter.
During the 1st growing season euphorbias will not bloom flowers. They start blooming flowers from the 2nd season and some other varieties may take years. To harvest the fragrant flowers, the plant should mature completely and reach to a height of 2-3 feet tall.
Now harvest the euphorbia flowers early in the morning or evening using a sharp knife or scissors or simply pluck flowers using hands. Wear gloves so as to protect yourself from allergies.
To propagate euphorbias, you can prefer stem cutting or V-grafting method to grow. Propagating this method from cuttings is easy than growing from seeds which take less time to mature the plant and flower blooming.
During spring season the flower buds emerge, take tip cuttings with 3 pairs of leaves and by cutting (1/4) inch below the leaves. Here is the simple procedure that completely explains the growth of crown of thorn plants from cuttings.
This method is mostly preferred to recover the plant from root rot. It is an excellent way to add new species to your garden space.
Euphorbia plants can also be propagated through V-grafting method. This grafting method is mostly used for its cultivators by growers. Grafting is mostly used to join parts from 2 or more plants so as to appear as a single plant. In this method, the upper part of the plant grows on the root stem of another plant.
The stock plant is cut 2-3 inches above the soil and a deep V-shaped is made into the stock. Now insert scion into the stock and wrap together using a grafting tape. This grafting method helps to promote the plant growth by producing fragrant flowers with high yielding crop plants.
You can easily propagate crown of thorns by the division of parent plants. Take out the plants from the ground level and remove the soil from roots by washing with water. Allow the roots to dry for some time or cut immediately with a sharp knife. Each division must have several eyes and roots to propagate effectively.
Now place the crown of thorn plant division in a well-drain fertile soil. Water the divisions regularly and allow it to receive sunlight (6 hours a day) by placing it near window site. When it grows to a height of 10-12 inches tall you can transplant it to outdoors or encourage growing landscape.
Combine euphorbia plants with bulbine, succulents, leucadendron, lavender, purple heart and salvias to improve the plant growth. These companion plants help to deter pests, improve soil fertility and overcome diseases problem when planted in the outdoor garden.
The stem cutting should be planted in such a way to a depth that will remain secure. If you insert too much of the stem into the soil then it may absorb more amount of water which results in root rot disease. So it’s better to plant euphorbias 4-6 inches deep under the ground level to support the base with strings. add a layer soil containing 2 parts of garden soil and 1 part peat moss, sand & perlite.
You can start watering crown of thorns plant when it reaches to a height of few inches (hardly8-12 inches). Water the plant regularly in small amounts. During the summer season, water the plant in excess (1-2 inches per week) so as to withstand in extreme hot climatic conditions and very often in winter.
Euphorbias plants can tolerate full sun to partial shade conditions. It is a hard flowering crop plant that is grown for its beautiful ornamental fragrant flowers. When you start planting euphorbias bring it to indoors (rooms) as the young plant of size 6-8 inches cannot tolerate cool weather conditions. But mature euphorbia plants can withstand up too 50F in the winter season.
Crown of thorns or christ plant has thorns lining at its stems and branches. In addition to the pruning, you must repot the thorn plants in summer season of every year. As it grows bigger and bigger the plant leaves, stems and roots develop accordingly. So when you have planted the thorns in pots, there may be chances of roots emerging out of the pot. At this stage, you need to repot the plant for a better growth.
Stems of thorn plant get mushy and the leaves fall off, turn yellow when the soil is too wet. To overcome this problem move your thorn plant to a warm bright location where there is good air circulation. Allow 50% of the soil of crown of thorns plant to dry out before you water the plant again.
For more information: Why are my plants turning yellow?
Yes, euphorbia plants are poisonous as it contains poisonous sap even when touching the plant. The sap of the plant is typically milky white and much dangerous to your pets when the consumed result in drooling, allergic reactions, vomiting and diarrhea symptoms.
The plant is often used as traditional Chinese medicine and as hedging plants in many parts of Africa. Some parts of the plant above ground contain a chemical compound called ingenol mebutate in medicine to treat asthma, chest congestion, and bronchitis. Few people use the plant leaves to cause vomitings.
Start growing crown of thorns plants in pots or outdoors that adds beauty to your home garden. If you have amazing ideas about growing crown of thorns, please share your experience with us in the comment section.
Recommended Readings
Jasmine If you are looking for a plant that smells fabulous in your home, jasmine…
Cabbage-Brassica Oleracea Cabbage is a green leafy biennial plant that grows as an annual…
Orchids is one of the top air-purifying plants that you can grow in your home.…
Carrot- Daucus Carota Wondering, How to Grow Carrots in your Home? If you are a…
Pea (Pisum Sativum) is an annual plant that grows as a cool season crop in…
Mentha - How to Plant, Grow and Care for Mint Easily Do you know how…
View Comments
My crown of thorns loves being fertilized twice a year with coffee grounds.
please advise how can polinate flowers with brush