Thuja are evergreen conifer trees with a narrow, conical habit, and Thuja occidentalis 'Smaragd' i...Thuja are evergreen conifer trees with a narrow, conical habit, and Thuja occidentalis 'Smaragd' is a beautiful example of this highly decorative variety. Slow-growing, ornamental shrubs with erect sprays of bright green, aromatic foliage, the Emerald Thuja is a colourful way to add height and structure to your beds and borders. Perfectly happy as a container plant, anyone can grow this garden gem, whether you have a large garden or a compact terrace or balcony. Easy to grow, 'Smaragd' (or the White Cedar as it is sometimes referred to) is a great plant for both new and experienced gardeners as it requires little to no maintenance - its growth is naturally narrow, so it doesn't need regular pruning to keep its shape. Hardy down to -45C, thuja are also extremely tolerant of the cold, just needing protection from drying winter wind especially while it is young. The perfect plant for flower beds and borders, Thuja Smaragd excels in city & courtyard gardens as well as cottage & informal gardens, gravel and rock gardens as well as on the patio in a container. Supplied as 12 established plants in 9cm pots, ready for immediate planting. Grow to around 2.5m x 2.5m.
The YouGarden Thuja Smaragd (12 Pack) is ideal for gardeners seeking to add evergreen structure and color to their landscapes, offering a low-maintenance solution for both large gardens and small spaces like balconies. Its key benefit is its naturally narrow, conical growth habit which requires minimal pruning, providing year-round ornamental appeal. A slight caveat is its need for protection from drying winds while young. This guide covers its features, how to plant and care for it, and answers common questions to ensure successful growth.
All features
Model Part Number
Smaragd
Brand
You Garden
Extended Product Information
FAQs
How much space does Thuja Smaragd need?
It typically grows to around 2.5 meters in height and 2.5 meters in width. Allow adequate space for this mature size, especially if planting multiple specimens or in a border.
Can I plant Thuja Smaragd in a container?
Yes, Thuja Smaragd is well-suited for container planting, making it ideal for balconies and patios. Ensure the container has good drainage and use a suitable potting mix.
Do I need to prune my Thuja Smaragd?
Pruning is minimal. Its natural growth habit is narrow and conical. You only need to prune to remove dead, diseased, or crossing branches, or if you wish to lightly shape it.
How cold hardy is this plant?
Thuja Smaragd is extremely hardy, tolerating temperatures down to -45°C.
When is the best time to plant?
The best times to plant are spring or autumn, when the soil is moist and temperatures are moderate. This allows the roots to establish before the extremes of summer heat or winter cold.
How often should I water my Thuja Smaragd?
Water regularly after planting for the first growing season. Once established, it is drought-tolerant but benefits from watering during extended dry periods.
What kind of soil does it prefer?
Thuja Smaragd prefers well-drained soil. It can tolerate a range of soil types but avoid areas that become waterlogged, as this can lead to root rot.
Troubleshooting
Yellowing or browning foliage
This can be caused by underwatering, overwatering, or exposure to drying winds. Check soil moisture, ensure good drainage, and provide wind protection if necessary, especially for young plants.
Plant not establishing or growing slowly
Ensure the plant is in well-draining soil and receives adequate sunlight. Check for any signs of stress from transplanting or extreme weather. A light feed in spring may help if soil nutrients are low.
Pests or diseases not apparent
Thuja Smaragd is generally pest and disease resistant. If issues arise, inspect for common issues like spider mites or fungal infections and treat with appropriate organic or chemical controls.
Plant appears sparse or leggy
While naturally narrow, extreme shade or lack of nutrients can contribute to legginess. Ensure adequate light and consider a spring fertilizer if growth is weak. Prune lightly to encourage denser growth if desired.
Pros and Cons
Pros
Provides year-round visual appeal with evergreen foliage.
Naturally retains a desirable shape, significantly reducing pruning effort.
Suitable for a wide variety of garden settings, from formal beds to container planting.
Extremely cold-hardy, tolerating temperatures down to -45°C.
Aromatic foliage adds a sensory element to the garden.
Easy to grow, making it accessible for beginner gardeners.
Cons
Requires protection from drying winter winds when young.
Slow-growing nature means it takes time to reach mature size.
Needs adequate space to reach its full potential height and width.
Can be susceptible to root rot if planted in waterlogged soil.
May require occasional feeding to maintain optimal health and color.
Setup, Compatibility & Care
Planting:
Dig a hole twice the width of the root ball and of a similar depth.
Gently remove the plant from its 9cm pot, loosening any tightly bound roots.
Place the plant in the hole, ensuring the top of the root ball is level with the surrounding soil.
Backfill the hole with soil, firming gently around the base.
Water thoroughly after planting.
Location:
Prefers full sun to partial shade.
Avoid sites with strong, drying winds, especially for young plants.
Ensure good drainage; avoid waterlogged soil.
Care:
Watering: Water regularly during the first growing season, especially during dry spells. Once established, it is relatively drought-tolerant but benefits from occasional watering in prolonged dry periods.
Pruning: Minimal pruning is required due to its natural shape. Prune only to remove dead, damaged, or crossing branches, or to lightly shape if necessary. The best time for any pruning is late spring or early summer.
Feeding: Generally, no feeding is required. If growth seems slow or foliage lacks vibrancy, a light feed with a balanced fertilizer in spring can be beneficial.
Protection: Young plants should be protected from harsh winter winds. This can be achieved by using a temporary windbreak or wrapping them with horticultural fleece.