Spurge (Euphorbia 'Froeup' EXCALIBUR)

Overview

Euphorbia ‘Froeup’ EXCALIBUR is a visually striking, clump-forming perennial prized for its long-lasting, bright yellow bracts that emerge in the summer months. This variety of Spurge provides excellent structure in the garden, beginning the season with attractive red-tinted new foliage that matures into deep green leaves with a distinctive yellow midrib. It delivers high ornamental impact with surprisingly low maintenance requirements once established, making it a favorite for expert and novice gardeners alike.

This particular selection, Euphorbia ‘Froeup’ EXCALIBUR, thrives under conditions that mimic a Mediterranean climate, demanding sharp drainage to survive. While it prefers full sun, a little afternoon relief prevents stress during the hottest parts of summer. Its robust nature resists common pests, although caution must be taken due to the presence of irritating milky sap found throughout the plant.

Gardeners value the reliable color display of this Spurge, which holds its form well when sited appropriately. Its architectural habit and reliable performance in dry conditions make Euphorbia ‘Froeup’ EXCALIBUR a valuable asset for xeriscaping or mixed perennial borders needing structure and consistent summer interest.

Fast Facts

Plant Family: Euphorbiaceae
Plant Type: Herbaceous perennial
Hardiness Zones: USDA Zones 6-8
Size at Maturity:
- Height: 2-3 ft
- Spread: 1.5-2 ft
Bloom Time: June to July
Bloom Description: Yellow
Sun Exposure: Full sun
Water Needs: Dry to medium
Maintenance Level: Low

How to Grow

Planting Euphorbia ‘Froeup’ EXCALIBUR should occur when the soil is workable, ideally in spring or early autumn, ensuring the location offers full sun exposure. The absolute most critical factor for success is soil drainage; this Spurge must have sharply-drained soil, as wet conditions, especially in winter, will prove fatal. While tolerant of some poor, rocky-sandy soils, avoid any location where water pools or remains saturated after rain.

Watering needs for this perennial are low to medium once establishment is achieved; treat it like a drought-tolerant plant. Fertilization is rarely necessary; over-fertilizing can lead to lush soft growth which may compromise its upright habit. Minimize pruning, as the structure is largely self-supporting, though faded flower stalks can be trimmed back after blooming concludes.

In very hot, humid summer climates, consider siting Euphorbia ‘Froeup’ EXCALIBUR where it receives a light break from the most intense, late afternoon sun to prevent stress. Be aware that placing this plant in excessive shade will cause the clumps to open up, drastically reducing their attractive, tidy shape. For gardeners in borderline zones, such as the southern edge of Zone 6, providing a protected location can enhance winter survivability.

Landscape Uses

Euphorbia ‘Froeup’ EXCALIBUR is highly versatile, particularly effective when utilized near the front or middle of perennial borders where its upright form can define an edge. Its architectural texture works beautifully in rock gardens, contrasting sharply with softer, mounding plants. The bright yellow summer blooms also make it an excellent addition to beds requiring long-term, color-stable visual anchors.

When planning companions, select plants that enjoy similar culture—full sun and dry to medium soil—and that do not require constant moisture. The foliage and structure of this Spurge allow it to pair well with ornamental grasses, silver-leaved perennials, or late-season bloomers that appreciate well-drained conditions. Use it sparingly near pathways where its toxic sap might accidentally contact skin without gloves.

Standout Features

Flower Qualities

Showy

Noteworthy Characteristics

Euphorbia is a genus of about 2,000 species of annuals, herbaceous perennials, trees, shrubs and succulents found in temperate, subtropical and tropical areas. All plant parts are toxic and can cause severe discomfort if eaten. The milky sap can cause skin irritation. Genus name probably honors Euphorbus, physician to the King of Mauretania. EXCALIBUR is a clump-forming perennial that is noted for its attractive foliage and long lasting flowers (actually yellow bracts). It typically grows to 3’ tall. Red-tinted early spring foliage. Mature green leaves have a light yellow central midrib. Yellow flowers in corymbs appear in summer with long-lasting pale yellow bracts. Pink stems turn deeper red in autumn.

Tolerances

Rabbit
Deer
Drought
Dry Soil
Air Pollution

Potential Problems

This plant is generally free of serious insect or major disease issues, which contributes to its low maintenance rating. The primary concern involves handling; always wear gloves when working around Euphorbia ‘Froeup’ EXCALIBUR. The milky white sap contained within the stems and leaves is toxic and can irritate skin, sometimes causing a rash upon contact. Deer usually avoid consuming this Spurge due to its toxicity factors, offering a natural layer of protection in the landscape.

Frequently Asked Questions

What hardiness zones is Spurge suitable for?

Euphorbia ‘Froeup’ EXCALIBUR is reliably hardy in USDA Zones 6 through 8.

How large does Spurge grow?

This perennial typically matures to a height of 2 to 3 feet tall, with a spread of 1.5 to 2 feet wide.

What sun exposure does Euphorbia ‘Froeup’ EXCALIBUR need?

This plant requires full sun for the best performance, although a break from intense afternoon heat is appreciated in the hottest parts of its range.

When does Spurge bloom?

The yellow flowers, which are technically bracts, appear reliably from June into July.

Conclusion

Euphorbia ‘Froeup’ EXCALIBUR is an exceptional choice for gardeners seeking durable, low-water perennials that deliver consistent structural interest and bright summer color. Its resistance to browsing deer adds functional value alongside its aesthetic appeal. Before planting your Spurge, confirm your site offers the sharp drainage this Euphorbia variety critically demands to ensure its long-term success in your garden.

Companion Planting

When designing mixed plantings around the Spurge, focus on species that share its preference for excellent drainage and dry to medium moisture regimens. Good companions include many Sedums (Stonecrop), which share drought tolerance and offer contrasting textures. Certain ornamental grasses, particularly those suited to hot, dry sites like Blue Fescue, complement the upright habit of the Euphorbia ‘Froeup’ EXCALIBUR without competing aggressively.

Another effective grouping involves silver-leaved plants such as Artemisia or Stachys byzantina (Lamb’s Ear). The pale foliage provides a cool contrast to the bright yellow spring/summer color of the Spurge foliage and bracts. Ensure all companions are planted at a distance that allows adequate air circulation, which helps prevent moisture buildup around the base of the Euphorbia perennial.

Seasonal Care Calendar

Spring preparation for Euphorbia ‘Froeup’ EXCALIBUR involves minimal intervention; usually, just removing any protective winter mulch once frost danger has passed. Avoid heavy spring feeding, as rich soil encourages weak growth unsuitable for this plant. As summer progresses, monitor moisture levels, especially during prolonged dry spells, though established plants rarely require supplemental water if the soil is well-drained.

Summer flowering lasts through July, offering reliable color until the blooms fade slightly. After blooming, you may shear the spent flower stalks if you prefer a neater look, though this is often unnecessary. In autumn, the stems may deepen to a pleasing red hue, providing late-season interest before dormancy sets in.

Winter care is primarily structural; do not cut back the dead stems, as they can offer some residual protection to the crown through the colder months. Wait until early spring, just before new growth emerges, to shear the material back close to the ground. Remember that site-specific conditions, especially low winter temperatures or high humidity, dictate planting success more than specific winter routines.