Mature size & growth rate

How big does Common Valerian (Valeriana officinalis) get?

Also called Common Valerian, Garden Valerian, Garden Heliotrope, All-heal.

More about common valerian

About Common Valerian

Valeriana officinalis · also called Common Valerian, Garden Valerian · herb

Valeriana officinalis is a tall, vigorous herbaceous perennial native to Europe and parts of Asia, widely naturalised in North America, and grown historically as a medicinal herb whose roots yield the well-known sedative valerenic acid. It thrives in full sun to partial shade in consistently moist, fertile soil and is commonly found beside streams, in damp meadows, and in cottage gardens. The most important care fact is that it can spread aggressively by self-seeding; deadhead after flowering to keep it contained. Valeriana officinalis is not listed as toxic to cats or dogs by the ASPCA, though it is psychoactive in cats.

Mature size: 100–150 cm (39–59 in) tall, 50–90 cm (20–35 in) wide.

Indoor size vs how big it gets in the wild

Common Valerian 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 100–150 cm (39–59 in) tall, 50–90 cm (20–35 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

Common Valerian 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: apply a balanced, general-purpose fertiliser or well-rotted compost in spring to support vigorous growth; plants in rich soil may need no additional feeding.

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

How to keep common valerian smaller

You are not stuck with the maximum size. For common valerian specifically, these are the levers, in order of impact:

Divide the clump every year or two — splitting common valerian 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 common valerian 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 common valerian bigger or faster

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

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger.
Good light plus regular feeding maximises offset and runner production.
Leave plantlets and offsets attached and feed through the growing season for the fastest spread.

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

When common valerian outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for common valerian:

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 common valerian repotting guide. If you want more of this plant instead of a bigger one, the common valerian propagation guide turns prunings into new plants.

Common Valerian size — frequently asked questions

How big does common valerian get?

Common Valerian reaches 100–150 cm (39–59 in) tall, 50–90 cm (20–35 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 common valerian slow or fast growing?

Common Valerian is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Common Valerian 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 common valerian 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 common valerian smaller?

Divide the clump every year or two — splitting common valerian 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 common valerian grow bigger or faster?

Give it a wider pot and let the clump fill it — width is exactly how this plant gets bigger. Good light plus regular feeding maximises offset and runner production. Leave plantlets and offsets attached and feed through the growing season for the fastest spread.