Getting it to bloom

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

Also called Farrer's gentian, Cambridge-blue gentian (Gentiana farreri).

More about farrer's gentian

About Farrer's Gentian

Gentiana farreri · also called Farrer's gentian, Cambridge-blue gentian · flowering

Gentiana farreri is a semi-evergreen, mat-forming alpine perennial native to the mountain meadows of northwestern China and Tibet, named after the plant explorer Reginald Farrer. It produces exceptionally beautiful, large, pale Cambridge-blue trumpet flowers with greenish-white stripes on the outside, appearing in early to mid-autumn when most other plants have finished flowering. The most important care requirement is an acid, consistently moist but well-drained soil — it will not tolerate chalk or dryness at the root. This species is not known to be toxic to cats and dogs.

Plant type: flowering

Watch for — Failure to flower (lime intolerance): Plants growing in alkaline or calcium-rich soil develop yellowing leaves and refuse to flower; test soil pH before planting and acidify with sulphur chips or use a dedicated ericaceous growing medium.

The reasons farrer's gentian isn't blooming

Almost every non-blooming farrer's gentian 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 farrer's gentian 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 farrer's gentian to flower

Maximise sun. Give farrer's gentian 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 farrer's gentian and get the feeding right with the farrer's gentian 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

Farrer's Gentian 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 farrer's gentian care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Farrer's Gentian blooming — frequently asked questions

Why won't my farrer's gentian flower?

Farrer's Gentian 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 farrer's gentian bloom?

Give farrer's gentian 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 farrer's gentian normally bloom?