Mature size & growth rate

How big does Hazel 'Red Filbert' (Corylus avellana 'Purpurea') get?

Also called purple-leaf hazel, red filbert, ornamental hazel.

More about hazel 'red filbert'

About Hazel 'Red Filbert'

Corylus avellana 'Purpurea' · also called purple-leaf hazel, red filbert · edible

This purple-leaved hazel is an ornamental, edible-nut form of common hazel with deep red-purple spring foliage, purplish catkins and reddish husks. Hardy, easy and shade-tolerant, it suits hedges, woodland edges and mixed borders. Foliage colour holds best in full sun; nut yields are modest compared with dedicated cobnut cultivars.

Mature size: Typically 3-5 m tall and wide; readily kept smaller by coppicing or pruning. Growth is moderate, around 40-60 cm a year.

Indoor size vs how big it gets in the wild

Hazel 'Red Filbert' is a garden shrub whose final size is set more by your secateurs than by the plant — pruning, not luck, decides how big it gets. Indoors and in a pot, expect typically 3-5 m tall and wide. In the ground with no restriction it is a completely different plant — readily kept smaller by coppicing or pruning. growth is moderate, around 40-60 cm a year. — which is why the pot, the light and the pruning matter so much for the size you actually end up with.

Left unpruned it builds a woody framework that gets taller and wider every year; with annual pruning you hold it at whatever size suits the space.

Growth rate and years to mature

Hazel 'Red Filbert' 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: generally needs little feeding in reasonable soil; an annual spring mulch of compost or a light balanced feed maintains vigour. avoid excess nitrogen, which promotes leafy growth over catkins and nuts.

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

How to keep hazel 'red filbert' smaller

You are not stuck with the maximum size. For hazel 'red filbert' specifically, these are the levers, in order of impact:

Prune hazel 'red filbert' annually at the right time for its type — this is the primary, expected way to control its size.
Remove the oldest, thickest stems at the base each year to keep it open and within bounds.
Growing it in a large container rather than open ground naturally restricts the ultimate size.
Avoid heavy feeding if you want to limit growth — rich soil and lots of nitrogen drive bigger, faster shrubs.

The keep-it-smaller method, step by step

Prune at the right time. Time the cut to hazel 'red filbert''s type (after flowering for many spring shrubs, late winter for summer-flowering ones) so you do not lose the next display.
Take out the oldest stems. Remove up to a third of the oldest, thickest stems at the base to renew the shrub and contain it.
Shorten the rest. Cut the remaining stems back to an outward-facing bud at the height and width you want.
Restrict the roots. For a permanent size cap, grow it in a large container rather than open ground.

How to grow hazel 'red filbert' bigger or faster

If you want it to fill the space sooner, push the conditions rather than hoping — for hazel 'red filbert' the accelerators are:

Plant it in open ground in good soil — far more vigorous than a container-restricted plant.
Full sun (which it wants) plus an annual mulch and feed gives the strongest growth.
Water well through the first establishment years; a settled root system drives the fastest size gain.

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

When hazel 'red filbert' outgrows the room (or the pot)

"Too big" usually arrives as one of these signs for hazel 'red filbert':

It shades or crowds neighbouring plants, or blocks a path it used to clear.
Bare, woody, unproductive centres with growth only on the outside — a sign it needs renovation pruning.
It has clearly exceeded the space you allotted and an annual trim no longer holds it.

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

Hazel 'Red Filbert' size — frequently asked questions

How big does hazel 'red filbert' get?

Hazel 'Red Filbert' reaches typically 3-5 m tall and wide when grown indoors, and far larger where it grows unrestricted (readily kept smaller by coppicing or pruning. growth is moderate, around 40-60 cm a year.). Left unpruned it builds a woody framework that gets taller and wider every year; with annual pruning you hold it at whatever size suits the space.

Is hazel 'red filbert' slow or fast growing?

Hazel 'Red Filbert' is a fast grower. Expect two to four years from a young plant to a room-filling specimen in good light. Hazel 'Red Filbert' is a garden shrub whose final size is set more by your secateurs than by the plant — pruning, not luck, decides how big it gets.

How long does hazel 'red filbert' 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 hazel 'red filbert' smaller?

Prune hazel 'red filbert' annually at the right time for its type — this is the primary, expected way to control its size. Remove the oldest, thickest stems at the base each year to keep it open and within bounds. Growing it in a large container rather than open ground naturally restricts the ultimate size. Avoid heavy feeding if you want to limit growth — rich soil and lots of nitrogen drive bigger, faster shrubs.

How can I make hazel 'red filbert' grow bigger or faster?

Plant it in open ground in good soil — far more vigorous than a container-restricted plant. Full sun (which it wants) plus an annual mulch and feed gives the strongest growth. Water well through the first establishment years; a settled root system drives the fastest size gain.