Getting it to bloom

Why won't my Clematis 'Rouge Cardinal' bloom? (and how to make it flower)

Also called Rouge Cardinal clematis, Red Cardinal clematis (Clematis 'Rouge Cardinal').

More about clematis 'rouge cardinal'

About Clematis 'Rouge Cardinal'

Clematis 'Rouge Cardinal' · also called Rouge Cardinal clematis, Red Cardinal clematis · flowering

Clematis 'Rouge Cardinal' is a Group 3 large-flowered clematis bearing rich velvety crimson-red blooms with cream anthers from midsummer into autumn. An outstanding climber for trellis, pergola, or growing through shrubs. Hard-pruning in late winter keeps it vigorous and compact. Toxic to pets and humans if ingested.

Plant type: flowering

Watch for — Aphids and earwigs: Can damage new growth and flowers. A jet of water or insecticidal soap manages aphids; earwig traps (rolled newspaper or clay pots filled with straw) reduce petal damage.

The reasons clematis 'rouge cardinal' isn't blooming

Almost every non-blooming clematis 'rouge cardinal' 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 clematis 'rouge cardinal' 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 clematis 'rouge cardinal' to flower

Maximise sun. Give clematis 'rouge cardinal' 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 clematis 'rouge cardinal' and get the feeding right with the clematis 'rouge cardinal' 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

Clematis 'Rouge Cardinal' 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 clematis 'rouge cardinal' care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Clematis 'Rouge Cardinal' blooming — frequently asked questions

Why won't my clematis 'rouge cardinal' flower?

Clematis 'Rouge Cardinal' 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 clematis 'rouge cardinal' bloom?

Give clematis 'rouge cardinal' 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 clematis 'rouge cardinal' normally bloom?