Getting it to bloom

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

Also called Bottle gentian, Closed gentian, Closed bottle gentian, Dakota gentian (Gentiana andrewsii).

More about bottle gentian

About Bottle Gentian

Gentiana andrewsii · also called Bottle gentian, Closed gentian · flowering

Gentiana andrewsii is a native North American perennial found in moist meadows, woodland edges, and stream banks from Quebec to Nebraska. It produces distinctive deep blue, bottle-shaped flowers that stay closed at the tip in late summer and autumn — only strong bumblebees can pry them open to pollinate. The single most important care fact is consistent moisture: this species needs reliably moist, humus-rich, acidic soil and will not tolerate drought or waterlogged conditions. Gentiana andrewsii is not listed as toxic to cats or dogs by the ASPCA, and is considered non-toxic to pets.

Plant type: flowering

The reasons bottle gentian isn't blooming

Almost every non-blooming bottle 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 bottle 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 bottle gentian to flower

Maximise sun. Give bottle 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 bottle gentian and get the feeding right with the bottle 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

Bottle 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 bottle gentian care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Bottle Gentian blooming — frequently asked questions

Why won't my bottle gentian flower?

Bottle 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 bottle gentian bloom?

Give bottle 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 bottle gentian normally bloom?