Getting it to bloom

Why won't my Joseph's coat bloom? (and how to make it flower)

Also called Joseph's coat, Chinese spinach, tampala, fountain plant, summer poinsettia, tricolor amaranth (Amaranthus tricolor).

More about joseph's coat

About Joseph's coat

Amaranthus tricolor · also called Joseph's coat, Chinese spinach · flowering

Joseph's coat is a heat-loving warm-season annual cultivated for its brilliantly multicoloured leaves of scarlet, gold, green and bronze rather than its flowers. Native to tropical Asia, it is also eaten as a leaf vegetable across South and South-East Asia. It needs full sun, warmth and free-draining soil to display its brightest colour. Treat ornamental Amaranthus as mildly toxic around pets due to genus-level oxalate content.

Plant type: flowering

Watch for — Premature bolting (flowering): Cool temperatures or drought stress trigger early bolting, diverting energy from colourful leaves to flowers — maintain warmth, consistent moisture and pinch out flower heads to prolong foliage display.

The reasons joseph's coat isn't blooming

Almost every non-blooming joseph's coat 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 joseph's coat 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 joseph's coat to flower

Maximise sun. Give joseph's coat 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 joseph's coat and get the feeding right with the joseph's coat 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

Joseph's coat 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 joseph's coat care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Joseph's coat blooming — frequently asked questions

Why won't my joseph's coat flower?

Joseph's coat 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 joseph's coat bloom?

Give joseph's coat 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 joseph's coat normally bloom?