Euphorbias, also referred to as spurge, are perennial plants that are simple to grow. They might be landscape plants or indoor houseplants. The euphorbia genus includes small annual plants and enormous, long-lived trees. One of the largest genera of flowering plants, the genus has approximately 2,000 species. The Americas, Madagascar, and Africa are where the majority of the succulent species are found.
Seed Propagation
Although they may be grown from seed, euphorbias can be challenging to germinate. In equal parts coarse sand and commercial seed growing mix, sow seeds in the spring. Germination takes 2 to 6 months in cold weather, but can take place in 1 to 2 weeks in warm weather.
Stem Cuttings
For many species of euphorbias, cutting-based propagation is the simplest and fastest approach. It can also be used to trim an old plant back into shape. Use a clean, sharp knife to make the cuttings. If at all possible, branching species should be clipped at the branching point. Decapitate solitary plants like Euphorbia bupleurifolia or Euphorbia piscidermis to promote the growth of side shoots that may then be pulled off and planted.
Spring, when growth begins, is the ideal season to collect cuttings, but summer is also a good period. Cuttings should only be used in an emergency to save plants with root rot since they have little chance to take root when taken in the fall or winter.
After cutting, the latex must be entirely removed in a glass of water or by spritzing. Quickly following the flow, cold water and a brief contact with a candle or match ignite.
Large-leaved Euphorbias should have the leaves chopped off with a knife directly above the cut. Before planting, the cut surface should be allowed to dry for one or better, several days, for species without leaves. Leafy Madagascan plants just require a little period of drying. Root formation will be aided by applying a hormone rooting powder to the sliced surface. The same planting media used for seeding can be used.
Rooting may take longer than anticipated, but it can be hastened by employing a thermostat-controlled warming pad to raise the soil temperature to about 77 F (25 C). Avoid being in the sun directly. Unrooted cuttings that have dried up can occasionally be salvaged by soaking in water that is at room temperature until they swell back up and can be planted again.
Some euphorbias with side shoots that can be rooted grow as branches and do not take the conventional plant form. This group includes the Medusoid Euphorbias in addition to Euphorbia brevitorta, Euphorbia groenewaldii, Euphorbia tortirama, and other species. These demand for the so-called two-step cutting technique.
Leaf Cuttings
Euphorbia francoisii, Euphorbia cylindrifolia, Euphorbia pachypodioides, Euphorbia ankarensis, and Euphorbia millotii are a few of the Madagascan Euphorbias that have been successfully propagated from leaf cuttings. Rock wool cubes are set on coarse sand in a tray, and leaves are gently removed off the plants—not cut—and placed inside of them. The sand should have water covering its surface (putting the leaves directly into damp sand also works, although with greater losses). Fungicide and hormone rooting powder help the process. Both gentle heat and a cool position with a plastic cover to increase humidity should produce the desired result. The plants are ready to be potted after 40 days because they are sufficiently matured.
How long does it take for Euphorbia cuttings to root?
When the right conditions are present, the majority of the evergreen euphorbia species will self-sow. Young seedlings can be pulled off the plant. Like other perennials, the non-evergreen varieties can be divided in the early spring or the early fall. These procedures can also be used to successfully develop evergreen and woody species from cuttings.
How is Euphorbia Mammillaris propagated?
The thorny bushlands of South Africa are the natural habitat of Euphorbia mammillaris. Near the plant’s base, it develops a stout main stem with tiny, club-like lateral branches. The plant’s variegated variety, which has white and green flecks throughout, is more vulnerable to bright sunlight than its all-green relative.
- ‘White Rockets’ need a lot of light, ideally at least five hours in direct sunlight. These plants can be grown indoors in a window that faces south.
- Because variegated types are more susceptible to sunburn than other varieties, if you’re growing this plant outside, place it in a spot with some light shade to shield it from the midday sun.
- Above 70 oF, Euphorbia mammillaris will flourish in high temperatures. Up to 35 oF, they can tolerate the cold.
- These semi-arid plants favor dry settings, yet they can also thrive in environments with some humidity if they want.
- Euphorbias favor arid environments. To water effectively, completely soak the soil and let it air dry in between applications.
- Water your plants regularly in the spring and summer, and less frequently in the fall and winter.
- The soil needs to be grittier and drain properly for these succulent plants. The best soil to use is one for cacti or succulents. To increase grit and drainage, soil combinations can be supplemented with sand or fine pumice up to 50%.
- ‘White Rockets’ normally bloom in the early spring through the first part of the summer. Cyathia are little, yellow flowers that grow at the ends of stems.
- Although fertilization can be administered to give plants a boost throughout the growing season or to restore depleted soil, these plants normally do not need it.
- Only during the growing season, use a balanced fertilizer once a month, diluted to half its intensity. During the fall and winter, stop using fertilizer.
- These plants can be easily multiplied from stems that branch off at offsets. Use cutting shears to separate offsets. Before planting cuttings in soil, give them a few days to callus. After the roots begin to form, keep the soil relatively dry before watering normally.
- Although euphorbias typically withstand pests and diseases, there are still a few things to watch out for. Pests that are most frequently seen are mealybugs and spider mites. Use diluted neem oil or a pesticide to treat the afflicted plants.
- Other issues to be on the lookout for include root rot and powdery mildew, which typically result from overwatering or inadequate air circulation, respectively. When growing a plant, always err on the side of underwatering and place it where it will get enough of ventilation.
- These plants need very little to no upkeep. Euphorbias prefer to be root-bound and have fine, shallow roots. One repotting should be performed every two to three years at most. Put potted plants into a container that is 2 inches wider than usual to give them room to expand.
- Every Euphorbia plant has a poisonous sap that is highly irritating to the skin and extremely toxic if consumed. Keep children and pets out of reach. When handling this plant, use gloves and exercise extreme caution.
Deadheading
Portion Euphrobia that have a permanent framework of branches will require deadheading after flowering, or if the entire stem that was flowering starts to die back, you can clip out some of the branches at the base. A good dome of brief, unflowered stems or shoots will remain, and they’ll bloom the next year. E. characias subsp. wulfenii and E. myrsinites are two examples.
E. amygdaloides var. robbiae is an evergreen groundcover that can be deadheaded in the summer to tidy up clumps by shearing off spent flower stems.
Mulching
Mulching borders is a great strategy to prevent weed growth and water evaporation. For typical garden growing conditions, this could be done with organic materials; however, if growing the silvery and grey species in a Mediterranean planting scheme, this might be done with gravel.
See our section on Deadheading in Ongoing Care above for more information on how pruning is typically done. Herbaceous plants, however, will die back throughout the winter, so you can tidy up the plant by removing any old, brown, or dead-looking stems.
These are multiplied through division. As you’ll do this right after flowering, it will happen in late spring for the earliest blossoming. The optimum time to divide anything that blooms later in the summer is in the spring when plants are just starting to grow.
Softwood cuttings are used to reproduce these shrubby-appearing euphorbias, especially the ones that grow stems one year and bloom the following year. In the early spring, use the young, short shoots at the base. E. characias and its relatives, E. myrsinites, and E. mellifera are excellent choices.
Although cultivars cannot be grown from seed and the seedlings will have somewhat different behaviors and colors, species can be grown from seed. When capsules become brown, gather the seed.
Should Euphorbia be reduced in size?
Euphorbias are a lovely addition to any garden since they add color in the spring and summer and have attractively shaped foliage. They also have vivid, colorful bracts.
Some evergreen euphorbias just require their faded blooms to be trimmed back once they have finished flowering. Others have biennial stems that must be trimmed to the ground after flowering, like several Euphorbia charcacia kinds. Fall is the time to trim down deciduous plants to the ground.
Wear gloves when handling euphorbias because they all have a thick, milky sap that can irritate the skin and eyes.
Does euphorbia require direct sunlight?
In general, euphorbias need a sunny location and rich, well-drained soil. Light types, meanwhile, can tolerate some shade and do well as ground cover around shrubs and trees.
How to plant euphorbias
Dig a deep hole when planting euphorbias that have been cultivated in pots and fill it with compost or leaf mould. Euphorbia should be planted firmly, then it should be watered well and mulched to keep moisture in and weeds out.
Here, Monty Don proposes two exceptional euphorbia species and provides planting instructions. Additionally, he offers advice on how to grow euphorbias from cuttings.
How to care for euphorbias
As long as the growing environment is favorable, euphorbias don’t need feeding or special care. After the blooms have faded, blooming stems should be pruned. However, gloves must always be used when working with euphorbias because their milky sap is hazardous if consumed and irritates the skin and eyes.
How to propagate euphorbias
Euphorbias can be grown by taking springtime cuttings. Make sure you use gloves to protect you from the sap.
Find out how easy and gratifying it is to propagate euphorbias by taking cuttings of Euphorbia characias subsp. wulfenii in spring. Monty Don gives ideas on how to keep the cuttings fresh, how to plant them and how to protect your hands from the unpleasant sap:
Euphorbias are they invasive?
Northern California is home to isolated occurrences of Euphorbia esula, which is displacing native plant species. Prairies, grasslands, and pine savannahs are just a few of the vegetation types it can invade and take over.
Euphorbias self-seed, right?
The secret to autonomous gardening is self-seeding vegetation. They expand the more you do nothing.
They are also free. You receive a lifetime of flamboyant flowers for the price of one seed package or one plant.
But while I was walking through my garden today, I did feel somewhat guilty. Over 25 different varieties of self-seeding plants were in my count.
Alliums, euphorbia, rosa glauca, and crocosmia all self-seeded in this area of the main boundary.
I do, I swear. However, my garden would be far less colorful without self-seeders. Additionally, I would need to invest a lot more time and money into it.
When can Euphorbia be reduced?
Trim away any winter damage as soon as spring arrives. In order to prevent disease and pest infestation, it is a recommended grooming practice to remove dead and broken stems from the plant’s base. Some cultivars require the removal of all old growth at the base as they die to the ground each winter in order to reappear from the roots.
Only the tips of stems that sprouted the previous year are where the majority of euphorbia species bloom. Throughout the spring and summer, trim back euphorbia stems to their base right after bloom to ensure that the plant doesn’t become overloaded and produces flowers on a regular basis. Use clean hand pruners to cut off a blossoming stem at the base as it begins to turn yellow, and then compost the clippings. Pinch the tips of kinds that have a tendency to become lanky and flop over as they get taller when new stems emerge. Shorter stems are the consequence, which are better able to support blooms.
How quickly does Euphorbia expand?
The heavier stems have a tendency to point in the direction of the light as they grow. To stop the container from leaning, rotate it.
The shedding of leaves is typical. In a few months, fresh leaves will emerge at the top of the stem.
I can get up to 30 feet tall in nature. I can grow quickly indoors in a container and reach a height of 5-8 feet. From the base, fresh, light-green shoots will emerge.
You may have overwatered if you notice rotting at the plant’s base or notice that the stems are no longer spongey. By removing the top treatment and allowing the soil to breathe, you might attempt to dry it out. If the stem is still too wet, you can cut it with a fresh corrugated knife and transplant it in fresh, drier soil.
Euphorbia reproduce in what ways?
The family Euphorbiaceae includes the genus Euphorbia. It is commonly recognized that this genus is one of the most varied in the entire plant kingdom, with approximately 2000 species. Euphorbias can range in size from weed-like, low-growing “spurges to magnificent, cactus-like succulents that can reach heights of several meters. One well-known species in this genus is the Poinsetta (E. pulcherrima), a stunning and well-liked houseplant.
The distribution of Euphorbia includes tropical regions of Africa (where the majority of the succulent Euphorbias are found), Madagascar, and the Americas as well as colder, temperate regions of Asia and Europe. Australia and the Pacific Islands both have euphorbia species.
When cut open, the majority of euphorbia species release a milky latex sap. This functions as both a defense mechanism to stop animals from eating the plant and a natural wound-healing mechanism for the plant. If it comes into touch with skin, it can result in excruciating inflammation and a rash. If consumed, some species’ latex can be quite harmful to people. The toxicities of several species are listed in this helpful resource.
This toxin has a di- or tri-terpene ester chemical structure, depending on the species. The distinctive feature that sets all euphorbia species apart from cacti is their milky sap.
A business in Australia is presently investigating the use of E. peplus sap as a skin cancer treatment. According to the notion, the sap kills the cancerous skin cells and forms a scab that finally falls off.
Due to the diversity of the genus Euphorbia, numerous reproductive strategies are seen. Monoecious plants have blooms on the same plant that are both male and female. Some Euphorbias have male and female blooms on separate plants, or they are dioecious.
This genus was given that name by Carolus Linnaeus in honor of the Greek physician Euphorbus, who is credited with discovering a use for Euphorbia as a medicine (most likely Resin Spurge).
This succulent is also a euphorbia. Take note of how the spines protrude in pairs, similar to the species seen to the right.
This Euphorbia has thick, protective skin and spines. As opposed to a cactus, the spines protrude in pairs.