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. The desired outcome should be achieved using both light heat and a chilly position with a plastic cover to boost humidity. The plants are ready to be potted after 40 days because they are sufficiently matured.
Euphorbia can be rooted in water, right?
A succulent euphorbia called Euphorbia trigona is grown for its ornamental stems. If it is rooted in water, it will rot and should not be. Take a stem cutting of this plant in late spring or early summer to propagate it.
When taking cuttings, keep your skin and eyes protected because the sap might irritate some people’s skin or eyes or perhaps create an allergic response. The health of the parent plant and the cutting depends on stopping the flow of milky sap. Spray water onto the parent’s wound after dipping the cutting end in water. To prevent infection, allow the cutting to “heal” (dry out) for a few days. Create a container with a peat moss base that has been wet, add perlite for enhanced drainage, and then top it with a layer of horticultural sand or vermiculite to avoid rot. Place the cutting in the potting mixture and keep it at room temperature in filtered light.
For around two months, keep the potting material just slightly damp. By that time, the cutting will have developed roots and new growth. The plant can be replanted in a succulent potting mix and cared for as an adult euphorbia.
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 a slice of a Euphorbia cactus rooted?
Use safety gloves before propagating Euphorbia trigona to avoid any allergic reactions to the milky sap. When you cut a Euphorbia plant, it will flow a sticky, white sap that shouldn’t get in your eyes, cuts, or sensitive skin. This is true of practically all Euphorbias.
When temperatures are between 70 and 75 degrees Fahrenheit, grow this deciduous succulent in the spring or summer for the greatest results. Trim off a stem end that is 5-7 inches long and in good health. Use a clean razor blade or a well-knifed, sterilized object.
The hotter seasons of the year are when cuttings root best. Take the cutting and give it a few days to calluse over. Depending on the size of the cutting, bury it in perlite (available from nurseries) at a depth of 2-3 inches or more. To support the plant and weigh down the pot, add a layer of gritty rock. This will prevent the cutting from toppling. Overwatering virtually never happens with perlite (perlite has replaced sand in current potting mixes). Place in a dimly lit area, be warm, and have patience.
See our Plant Information Guides for advice on a number of gardening-related issues. – With permission from NYBG Plant Information Service
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 thrive in containers?
With a bigger selection available by mail order from specialized plant nurseries, euphorbias are commonly available in garden centers, nurseries, and online retailers.
In the spring or as larger plants in bloom in the summer and early fall, they are primarily sold as plants. The majority are in 1- or 2-liter pots, however smaller plants can occasionally be seen in 9-cm (31/2-in) pots.
Where to plant
For information on growing requirements and actual size to determine spacing, check the plant label as this varies widely depending on what you select to plant. The RHS Find a Plant website also has euphorbia pictures and descriptions.
When to plant
In the majority of the UK, spring is the ideal time to plant since the moist soil and warmer temperatures promote rapid plant establishment. This is particularly true of the blue and silvery leafed varieties, which struggle to survive the winter on damp soils and are therefore best avoided throughout the fall and winter months.
How to plant
Euphorbias can be planted like any other boundary perennial. This is a straightforward process that often involves digging a hole that is larger than the new plant’s root ball, planting it there, and then covering the hole with soil that has been amended with organic matter, like well-rotted garden compost or manure. The organic stuff is not necessary for plants that prefer arid climates, such E. myrsinites. All need to be well watered in and kept moist until they take root.
While the majority of euphorbia prefer to grow in the ground, some, like E. myrsinites, can thrive in containers. This is mostly because they want soil that is freely draining and it is relatively simple to mix up potting compost that precisely meets their needs. Add one part of grit to three parts of John Innes No. 3 compost.
Euphorbia like shade, right?
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. Wear gloves to protect your hands from the sap.
By collecting cuttings of Euphorbia characias subsp. wulfenii in the spring, you can learn how simple and gratifying euphorbia propagation is. Monty Don offers advice on how to maintain the cuttings’ viability, plant them, and shield your hands from the irritating sap:
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.