Getting it to bloom

Why won't my Western Arborvitae Zebrina bloom? (and how to make it flower)

Also called Zebrina Giant Arborvitae, Variegated Western Red Cedar (Thuja plicata 'Zebrina').

More about western arborvitae zebrina

About Western Arborvitae Zebrina

Thuja plicata 'Zebrina' · also called Zebrina Giant Arborvitae, Variegated Western Red Cedar · flowering

A vigorous variegated form of western red cedar, 'Zebrina' carries soft, fern-like sprays banded gold and green that brighten in full sun. It makes a fast, conical specimen or screen, thriving in moist, fertile soil and cool, humid climates. Hardy and low-maintenance once established, it needs little pruning beyond shaping and tolerates a wide range of garden conditions.

Plant type: flowering

The reasons western arborvitae zebrina isn't blooming

Almost every non-blooming western arborvitae zebrina traces back to one of these, roughly in order of how common they are:

Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.
Too much nitrogen feed, driving lush foliage at the expense of flowers (very common with general or lawn feeds).
The plant has not been deadheaded, so it stops flowering once it sets seed.
Irregular watering — drought or waterlogging at the budding stage makes buds abort.
It is still too young or was checked by a transplant and is rebuilding before flowering.

Feeding western arborvitae zebrina a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.

The fix — how to get western arborvitae zebrina to flower

Maximise sun. Give western arborvitae zebrina the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers.
Switch the feed. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.
Deadhead regularly. Remove spent flowers often to keep it producing more rather than stopping to set seed.
Water consistently. Keep moisture even through budding and flowering — drought-then-flood swings make buds drop.

Light and feeding do most of the heavy lifting here. Dial in the spot with the light guide for western arborvitae zebrina and get the feeding right with the western arborvitae zebrina fertilising schedule — the wrong feed (too much nitrogen) is one of the most common silent reasons a healthy plant makes leaves instead of flowers.

Bloom season and what to expect

Western Arborvitae Zebrina flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.

Post-bloom care so it flowers again

Deadhead, keep feeding lightly, and many will rebloom; collect seed from the best plants at the end of the season if you want to grow them again.

For everything else this plant needs day to day, see the full western arborvitae zebrina care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Western Arborvitae Zebrina blooming — frequently asked questions

Why won't my western arborvitae zebrina flower?

Western Arborvitae Zebrina blooms on the season's growth given enough sun, warmth and the right feed — there is no cold or photoperiod trick, just good growing conditions and a bloom-leaning feed. The most common reason it is not happening: Too little sun — most of these need full sun (or very bright light) to flower well; shade gives leaves, not blooms.

How do I make western arborvitae zebrina bloom?

Give western arborvitae zebrina the sunniest spot you have — for most bedding and fruiting plants, more direct light directly means more flowers. Move off high-nitrogen feeds and use a higher-potassium "bloom" or tomato-type feed as it comes into flower.

When does western arborvitae zebrina normally bloom?