Getting it to bloom
Why won't my Large-Flowered Beardtongue bloom? (and how to make it flower)
Also called Large-Flowered Beardtongue, Large Beardtongue, Shell-Leaf Penstemon (Penstemon grandiflorus).
More about large-flowered beardtongue
About Large-Flowered Beardtongue
Penstemon grandiflorus · also called Large-Flowered Beardtongue, Large Beardtongue · flowering
Large-Flowered Beardtongue is a stunning Great Plains native perennial producing large, lavender-pink to pale violet tubular flowers on tall stems in late spring. Among the showiest native Penstemons, it thrives in dry, sandy or gravelly soils and full sun. It is a preferred host plant for specialist native Perdita bees and draws hummingbirds and bumblebees.
Plant type: flowering
Watch for — Short lifespan / monocarpy: Penstemon grandiflorus can be short-lived (2–4 years), and some individuals are monocarpic (die after flowering). Allow plants to self-seed, and propagate regularly to maintain the planting.
The reasons large-flowered beardtongue isn't blooming
Almost every non-blooming large-flowered 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 large-flowered 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 large-flowered beardtongue to flower
- Maximise sun. Give large-flowered 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 large-flowered beardtongue and get the feeding right with the large-flowered 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
Large-Flowered 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 large-flowered beardtongue care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.
Large-Flowered Beardtongue blooming — frequently asked questions
Why won't my large-flowered beardtongue flower?
Large-Flowered 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 large-flowered beardtongue bloom?
Give large-flowered 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 large-flowered beardtongue normally bloom?
Large-Flowered Beardtongue flowers across its growing season (mostly summer) and, kept fed and deadheaded, can bloom for many weeks or right up to frost.
What should I do with large-flowered beardtongue after it flowers?
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.
What is the single biggest mistake stopping large-flowered beardtongue flowering?
Feeding large-flowered beardtongue a high-nitrogen general feed and growing it in too little sun — you get a big leafy plant and almost no flowers.
Keep reading
- Large-Flowered Beardtongue care — the full brief (light, water, humidity, problems, pet safety)
- Large-Flowered Beardtongue light needs — usually the first thing to fix for flowers
- Large-Flowered Beardtongue fertilising — the right feed for buds, not just leaves
- Should I water my plant? The simple check
- Why is my plant wilting? Wet vs dry
- Underwatered plant — signs and rehydration
- Why won't my peace lily bloom?
- Why won't my jade plant bloom?
- Why won't my tomato bloom?
- All 2566 bloom guides in the Growli library