Getting it to bloom

Why won't my Tube Beardtongue bloom? (and how to make it flower)

Also called Tube beardtongue, White wand beardtongue (Penstemon tubaeflorus).

More about tube beardtongue

About Tube Beardtongue

Penstemon tubaeflorus · also called Tube beardtongue, White wand beardtongue · flowering

Tube beardtongue is a delicate, clump-forming prairie perennial native to the central and eastern United States, from Texas and Arkansas north to Illinois and Indiana, where it grows in dry prairies, open woodlands, and along roadsides. It produces slender, upright stems topped with loose clusters of small, white, narrowly tubular flowers from late spring into early summer, and is particularly attractive to long-tongued bees, swallowtail butterflies, and ruby-throated hummingbirds. Like all beardtongues it demands excellent drainage and will rot in wet soils; it is a reliable, low-maintenance plant for naturalistic gardens and prairies. Its toxicity to pets has not been confirmed by the ASPCA; treat as mildly toxic as a precaution.

Plant type: flowering

The reasons tube beardtongue isn't blooming

Almost every non-blooming tube beardtongue 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 tube beardtongue 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 tube beardtongue to flower

Maximise sun. Give tube beardtongue 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 tube beardtongue and get the feeding right with the tube beardtongue 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

Tube Beardtongue 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 tube beardtongue care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Tube Beardtongue blooming — frequently asked questions

Why won't my tube beardtongue flower?

Tube Beardtongue 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 tube beardtongue bloom?

Give tube beardtongue 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 tube beardtongue normally bloom?