Mature size & growth rate

How big does Diana Clare Pulmonaria (Pulmonaria 'Diana Clare') get?

Also called Diana Clare lungwort, silver lungwort.

More about diana clare pulmonaria

About Diana Clare Pulmonaria

Pulmonaria 'Diana Clare' · also called Diana Clare lungwort, silver lungwort · flowering

'Diana Clare' is an award-winning lungwort with long, almost wholly silver leaves and early spring flowers that open violet-pink and deepen to rich blue-violet. It forms vigorous, weed-suppressing clumps for moist shade. Pulmonaria isn't individually ASPCA-listed, so treat it with caution around pets.

Mature size: 25-35 cm (10-14 in) tall, spreading 45-60 cm (18-24 in) wide.

Watch for — Slug and snail damage: Soft spring growth is grazed in damp shade. Protect emerging crowns with barriers or wildlife-safe slug controls.

Indoor size vs how big it gets in the wild

Diana Clare Pulmonaria stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward. Indoors and in a pot, expect 25-35 cm (10-14 in) tall, spreading 45-60 cm (18-24 in) wide.. A pot, your light levels and a little pruning are what set the final size in a home, far more than the plant's theoretical potential.

Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Growth rate and years to mature

Diana Clare Pulmonaria is a fast grower. Realistically, expect two to four years from a young plant to a room-filling specimen in good light. Its feeding profile backs this up: undemanding; an annual spring mulch of compost or leaf mould usually meets its needs. a light balanced feed in spring on poor soils enhances the foliage display. avoid excess nitrogen, which softens growth and invites mildew.

Want this turned into the right next pot at the right moment? The pot size calculator and the diana clare pulmonaria repotting guide cover when and how much to size up — pot size is one of the biggest levers on how fast diana clare pulmonaria grows.

How to keep diana clare pulmonaria smaller

You are not stuck with the maximum size. For diana clare pulmonaria specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting diana clare pulmonaria is the main way to control its spread and refresh it.
Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump.
Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

The keep-it-smaller method, step by step

Lift the whole plant. Slide diana clare pulmonaria out of its pot in spring when the clump has filled it.
Split the clump. Tease or cut the rootball into two or more sections, each with healthy roots and growth.
Repot one division. Put a single division back in the original pot to reset it to a smaller size; pot or give away the rest.
Remove offsets as they form. Through the year, detach new runners or pups to stop it spreading again.

How to grow diana clare pulmonaria bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for diana clare pulmonaria the accelerators are:

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Brighter light speeds up clump and offset production noticeably.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

Light is almost always the ceiling. The diana clare pulmonaria light requirements page covers exactly how bright a spot it needs to grow at its potential instead of stalling.

When diana clare pulmonaria outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for diana clare pulmonaria:

The clump bulging over the pot rim or splitting the pot — the cue to divide, not to find a bigger room.
A dense centre that goes bare or tired while the edges keep spreading.
Runners or offsets escaping across the shelf or into neighbouring pots.

If it is the pot rather than the room, it is a repotting job, not a goodbye — see the diana clare pulmonaria repotting guide. If you want more of this plant instead of a bigger one, the diana clare pulmonaria propagation guide turns prunings into new plants.

Diana Clare Pulmonaria size — frequently asked questions

How big does diana clare pulmonaria get?

Diana Clare Pulmonaria reaches 25-35 cm (10-14 in) tall, spreading 45-60 cm (18-24 in) wide. when grown indoors. Size here is about width, not height: the plant builds an ever-wider clump or sends out plantlets and runners while staying relatively short.

Is diana clare pulmonaria slow or fast growing?

Diana Clare Pulmonaria is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Diana Clare Pulmonaria stays fairly low but widens over time — it spreads into a bigger clump by offsets, runners or rhizomes rather than shooting upward.

How long does diana clare pulmonaria take to reach full size?

Roughly two to four years from a young plant to a room-filling specimen in good light. Light, pot size and feeding move that timeline more than anything else.

How do I keep diana clare pulmonaria smaller?

Divide the clump every year or two — splitting diana clare pulmonaria is the main way to control its spread and refresh it. Remove runners, plantlets or offsets as they appear if you want it to stay a single tight clump. Keep it slightly pot-bound; a snug pot naturally limits how wide the clump can get.

How can I make diana clare pulmonaria grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Brighter light speeds up clump and offset production noticeably. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.