Crown of thorns (Euphorbia Milii) originally grew in Madagascar. This succulent shrub holds multiple stems and dark green leaves.
Thorns cover the branches. However, they feel relatively soft when touched making them not too difficult to work with.
The Crown of Thorns plant started to become popular during the Victorian era. Euphorbia Milii has several common names including:
- Crown of Thorns
- Christ plant
- Christ thorn
A recent great deal of cultivar development and hybridization took great interest on the crown of thorns. It resulted to a tremendous amount of choice in flower color and plant blossom size.
In addition to being an excellent houseplant, you can plant Euphorbia milii outdoors in the warm climates of USDA hardiness zones 9B through 11.
In this article, we will share information on growing crown of thorns. It will also provide tips on propagation and solutions for pests and diseases.
Crown Of Thorns Plant Characteristics
Apart from being an evergreen plant, Euphorbia Milli can also resist drought. It produces woody, succulent stems up to three feet high. The thorns cover the stems randomly and measure up to an inch long.
The bright green leaf bracts grow randomly and slightly sparse. They appear mostly on newer stems and fall away from the older stems. This means you can only find leaves on the youngest and newest portions of the plant.
Blooms appear mostly throughout the spring and late into the summer. However, in ideal conditions, the plant can produce flowers year-round.
To monitor the well-being of your crown of thorns, always check on its leaves. Sporadic shedding from mature stems does not indicate a problem. But if all of the leaves fall off suddenly, it signals stress which poses a threat to your plant.
If a sudden decrease in leaves happens, you must take the necessary steps to determine its cause. More often than not, excessive watering or poor drainage usually result to this. After solving the problem, the leaves may grow healthy again.
Daily Caring For Euphorbia Milii
Although crown of thorns belongs to the species of Euphorbia succulent plants, it can only store a limited amount of water using its stems. The plant also takes in water through the leaves, so misting the plant on a daily basis may help.
In fact, spraying with a weak saline solution works great because this plant does well at the seaside in full sun.
The plant needs minimal nourishment but does respond to slow-release fertilizer, and it does very well in poor but well-drained soil.
However, a special cactus soil mix would be best.
The root ball should not remain moist for an extended period to avoid root rot.
This plant has a high drought tolerance. However, the best way to water succulents like this plant is on a weekly basis and remember to allow the soil to dry completely.
Keep The Atmosphere Sunny And The Soil Light
This succulent plant hungers for sunlight. If you want the crown of thorns as a house plant, position it in a bright, sunny window on the west or south side of your home. Unlike many houseplants, bright light and likes direct sunlight.
As with all succulents and cacti, provide the soil with excellent drainage. A soil mixture containing about one-third perlite or pumice makes a good well-drained soil option.
The plant grows well if placed under direct bright light in areas with cooler summers. In the regions governed by scorching, summer weather, set the plant in areas with good afternoon shade to avoid withering.
Do not overdo with the shade as too much of it results in reduced flower production.
In outdoor containers, you may use a prepared cactus soil mix. Give the pot plenty of drainage holes and place it in a place where it can get ample sunlight.
Start your planting process with a layer of gravel on the bottom to ensure excellent drainage.
How To Fertilize Crowns Of Thorns
Although the crown of thorns remains healthy even without fertilizers, an occasional, diluted dose of basic fertilizer helps with bloom production. However, choose a type of fertilizer without boron as the plant reacts sensitively to this micronutrient.
This interesting succulent does not grow quickly and does not need a large amount of fertilizer. In the landscape, you should use a diluted solution of a balanced fertilizer (10-10-10) once a month in the springtime and throughout the summer. If using a granulated fertilizer, give four tablespoons per 10 square feet.
In outdoor containers, use a water-soluble liquid fertilizer (3–1–2 ratio) at a rate of half a teaspoon per gallon of water. Apply this dose every month. The same dosage also serves as an excellent solution for houseplants.
Maintenance And Pruning
Prune lightly (our favorite pruners here) to maintain the size and shape of your plants. Although evergreen, the crown of thorns naturally grows more vigorously throughout the spring and summer.
In the autumn, remove old branches with most of its leaves withered. This will stimulate more new growth when springtime arrives.
Remove dead, fallen leaves, and flowers from the surface of the soil. This will help with soil aeration and prevents fungal disease. Moreover, cut background leaves, stems, and other unattractive growth.
Avoid contact with the milky sap of the plant when you trim. This toxic, milky, white sap causes skin irritation and eye problems.
Clean your pruners thoroughly after each use. Wash the tool with water and wipe it clean using a cloth disinfected with rubbing alcohol.
Crown of thorns is one of the many good indoor plant types for greening your home. Floor plants, desktop plants, flowering plants and more.
What To Do With Crown Of Thorns During Winter Month
Letting houseplants stay outside in the summertime seems like a good idea. On the other hand, it takes little cold and damp to kill a crown of thorns or to get root rot started.
For this reason, move both container plants and potted plants indoors before the onset of rain or the winter season.
Transition the crown of thorns gradually when you move them back outdoors in the springtime.
Acclimate your plants by placing them outdoors in partial shade for one or two weeks before moving them into bright sunlight.
Check for all danger of frost and make sure those already melted before acclimation.
Diseases And Pests
Generally speaking, infestations and diseases plague crown of thorns rarely. However, plants kept indoors may occasionally encounter problems with spider mites on plants, different types of scale insects, and playing host to mealybugs.
As a solution to pests, wipe the foliage with a cotton ball or cotton swab dipped a few seconds in soapy water. You can also wash your plant under running water but try not to soak the soil. Otherwise, it may lead to a root rot.
Crown of thorns can acquire root rot if overwatered or planted in dense soil. If root rot sets in, saving the plant becomes highly impossible. You may need to take cuttings and start over.
More on –> Succulent Root Rot
How to Propagate
Making new plants and growing crown of thorns makes an easy planting hobby. Read on to learn more.
Propagation of cuttings makes an excellent way to add new and exciting specimens to your collection.
Crown Of Thorns Varieties
A wide range of hybrids and cultivars makes up the list of available Euphorbia Milli species. Look for interesting specimens such as:
- American Beauty – produces incredibly gorgeous scarlet red blossoms.
- Short and Sweet – this Euphorbia belongs to the dwarf category. It also produces showy, very attractive bright red bracts we call “red flowers.”
Some of the “New” Crown Of Thorns on the market!
- Hot Pink Crown of Thorns – Loves a sunny location
- Golden Crown of Thorns Known as Euphorbia splendens ‘Dinni’
While red serves as the traditional blossom color for these popular house plants, an entire group of California hybrids also features strong and sturdy stems. They appear enormous and hold larger flowers in colorful hues ranging from pink to peach to yellow. Among these are:
Above lists a few of the intriguing cultivars and hybrids available today. Below are several
Apart from being easy to grow, they look great and even stand out from a bunch of potted plants.
Gathering a complete collection of crown of thorns plants for your home and garden functions is a fun, fascinating and absorbing hobby.