Getting it to bloom

Why won't my Sidebells Penstemon bloom? (and how to make it flower)

Also called Sidebells Penstemon, Orchid Penstemon, One-sided Penstemon (Penstemon secundiflorus).

More about sidebells penstemon

About Sidebells Penstemon

Penstemon secundiflorus · also called Sidebells Penstemon, Orchid Penstemon · flowering

A drought-tough Rocky Mountain native perennial bearing one-sided spikes of lavender-blue tubular flowers in late spring. Thrives in full sun and fast-draining, gritty soils at elevation. Extremely low water once established, making it ideal for xeriscape and pollinator gardens in the central and southern Rockies.

Plant type: flowering

Watch for — Failure to bloom: Usually caused by insufficient direct sunlight or excessive soil fertility from heavy fertilizing. Move to a sunnier location and stop amending with nitrogen-rich composts.

The reasons sidebells penstemon isn't blooming

Almost every non-blooming sidebells penstemon 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 sidebells penstemon 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 sidebells penstemon to flower

Maximise sun. Give sidebells penstemon 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 sidebells penstemon and get the feeding right with the sidebells penstemon 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

Sidebells Penstemon 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 sidebells penstemon care brief and its watering schedule — a stressed, badly watered plant rarely has the energy to flower at all.

Sidebells Penstemon blooming — frequently asked questions

Why won't my sidebells penstemon flower?

Sidebells Penstemon 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 sidebells penstemon bloom?

Give sidebells penstemon 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 sidebells penstemon normally bloom?