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Inkberry

Ilex glabra · Aquifoliaceae

Inkberry (Ilex glabra)
Photo: Alex Abair, via Wikimedia Commons (CC BY 4.0)

A native evergreen holly with small, spineless, dark leaves and black berries. It tolerates wet soil, salt and shade.

Size
6½ ft tall, 6½ ft wide
Zones
4 to 10
Light
Full sun to part shade
Flowers
Grown for its leaves
Pets
Toxic (mild)
Job in a bed
Anchor

A bed built around inkberry

The planner designed this bed around inkberry when this page was made: a 16 × 8 ft (4.9 × 2.4 m) English border in zone 6, part sun. It chose the other plants from the 708 that suit those conditions, and says below why inkberry stands where it does.

A 16 × 8 ft (4.9 × 2.4 m) bed at eye level in late August: Inkberry, Mouse-ear coreopsis 'Nana', Carpathian bellflower 'Blue Clips', White mugwort, Siberian iris 'Caesar's Brother', Winter heath 'Kramer's Red', Hairy alumroot 'Autumn Bride', Red spider lily, Grecian windflower.
A 16 × 8 ft (4.9 × 2.4 m) English border in zone 6, part sun, seen from the path in late August.
1. Inkberry14. White mugwort44. White mugwort44. White mugwort43. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'32. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'23. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'32. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'23. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'33. Carpathian bellflower 'Blue Clips'35. Siberian iris 'Caesar's Brother'55. Siberian iris 'Caesar's Brother'55. Siberian iris 'Caesar's Brother'54. White mugwort42. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'26. Winter heath 'Kramer's Red'66. Winter heath 'Kramer's Red'66. Winter heath 'Kramer's Red'67. Hairy alumroot 'Autumn Bride'77. Hairy alumroot 'Autumn Bride'77. Hairy alumroot 'Autumn Bride'72. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'22. Mouse-ear coreopsis 'Nana'28. Red spider lily8. Red spider lily8. Red spider lily8. Red spider lily8. Red spider lily8. Red spider lily8. Red spider lily8. Red spider lily9. Grecian windflower9. Grecian windflower9. Grecian windflower9. Grecian windflower9. Grecian windflower9. Grecian windflower9. Grecian windflower
From above, to scale. Each circle is one plant, as wide as the room it needs.

The plants

  1. 2 Mouse-ear coreopsis 'Nana' × 32, yellow
  2. 3 Carpathian bellflower 'Blue Clips' × 12, blue
  3. 4 White mugwort × 4, cream
  4. 5 Siberian iris 'Caesar's Brother' × 3, purple
  5. 6 Winter heath 'Kramer's Red' × 3, pink
  6. 7 Hairy alumroot 'Autumn Bride' × 3, white
  7. 8 Red spider lily × 8, red
  8. 9 Grecian windflower × 7, blue

Why this plant

  • The only plant grown for its leaves. Leaf lasts all season, where a flower lasts a few weeks.
  • Part of the bed's structure. Shrubs and grasses keep their shape when the perennials die down. So does winter heath 'Kramer's Red'.

Why here

  • Anchors a back corner. At 6½ ft it is the tallest plant here, and the tallest close the ends of the bed, where they stand in front of nothing.
  • A step in the back row. Next to white mugwort (5 ft): no two neighbours there are the same height, so the back steps up and down like a skyline.
  • One plant, alone. A shrub is seen as an object, and needs clear ground around it.

Why now

  • Here for its leaves, all year. They cover the 8 weeks between early March and late November when nothing on the plan is in flower.
  • One of two evergreens. They are what the bed has to show from November to March.

Planned as an English border: 8 of the 10 groups (80%) are drifts, longer along the bed than they are deep. The bold leaves of hairy alumroot 'Autumn Bride' are set against the fine leaves of Siberian iris 'Caesar's Brother', the kind of contrast that keeps a bed from blurring. Something is in flower for 39 weeks, from mid January to early October.

The planner's own design check: 13 Excellent, 2 Good, 2 Satisfactory. It flags one thing to watch: Nothing on this plan is highly poisonous or an aggressive spreader.

Open this bed in the planner Change its size, the sun or the style, move plants about, or swap one for another.

Where inkberry goes in a border

At 6½ ft it belongs at the back of a bed. In the planner's ten height classes it is very tall (5 to 6½ ft).

Its job: anchor. A shrub that gives the bed permanent structure. Planted singly, as soon as the front edge is laid; everything else is arranged around it.

A native alternative to boxwood and Japanese holly. Older plants go bare at the base, so prune regularly, or plant something low in front.

  • A native evergreen hedge
  • Wet soil and rain gardens
  • Coastal gardens

What to plant with inkberry

Plants recorded as good partners for it, and what each pairing does:

  • Summersweet: adds the flowers, mid July to mid August; spires rising out of its mound; happy in the same moist soil.
  • Winterberry: happy in the same moist soil.
  • Virginia sweetspire: adds the flowers, early June to early July; spires rising out of its mound; happy in the same moist soil.

Choosing between it and a look-alike? Common boxwood vs Inkberry.

Questions about inkberry

Does inkberry need sun or shade?

Inkberry grows in full sun (6 or more hours of direct sun a day), part sun (4 to 6 hours of sun, including some afternoon sun) and part shade (2 to 4 hours of sun, mostly in the morning).

It wants soil that stays evenly moist, of average fertility, and a good soak in dry spells. It copes with soil that stays wet.

What zones does inkberry grow in?

USDA zones 4 to 10. It is hardy to zone 4, which means it survives winter nights down to about −20 °F (−29 °C).

Gardening in Canada? Use the USDA zone for your town: Canada's own zone map uses different numbers.

How far apart should inkberry be planted?

5 ft (150 cm) apart, from the middle of one plant to the middle of the next. That is a little closer than its full width of 6½ ft (200 cm), so a group knits into one patch.

It grows 6½ ft (200 cm) tall. Give it the full distance from anything taller, or it will lean out towards the light.

How many inkberry plants do I need?

Usually one. At 5 ft (150 cm) across, it is a plant you place, not one you mass. For a hedge or screen, set them 5 ft apart: three plants for a 10 ft run.

In the bed above, the planner used one in one group.

Is inkberry poisonous to dogs and cats?

Yes: mild toxicity to people, dogs, cats and horses. The berries and leaves cause vomiting and diarrhoea if eaten.

Rated from NC State Extension. Where references disagree, the more cautious rating is used.

Is there a pet-safe plant like inkberry?

These come closest to doing what inkberry does, and no toxicity is recorded for them:

Matched the way the planner's Swap button matches plants: the same job in a bed, then size, then flowering time.

Do deer eat inkberry?

Mostly not. NC State lists it as resistant to rabbits. No plant is proof against a hungry deer in a hard winter, but this one is low on the menu.

Will inkberry spread?

It spreads sideways, by runners or roots; the risk of it taking over is moderate. Spreads by suckers into a wider clump. Remove the outer shoots to contain it.

What does inkberry look like in winter?

Inkberry keeps its dark green leaves all winter, so it is one of the plants that hold a bed together from November to March, when the perennials have gone.

Is inkberry good for bees and butterflies?

Inkberry is visited by pollinators, bees, specialist bees, butterflies and songbirds.

It is a host plant: the caterpillars of henry's elfin feed on its leaves. A butterfly can only lay its eggs on its host plants, so these do more for it than any nectar flower.

It is native to the United States.

More Ilex

In these guides

Zone guides: Zone 4 · Zone 5 · Zone 6 · Zone 7 · Zone 8 · Zone 9

Every fact on record

Type
Shrub
Size
6½ ft (200 cm) tall, 6½ ft (200 cm) wide
Plant
5 ft (150 cm) apart
Height class
Very tall (5 to 6½ ft)
Place in the bed
Back
Flowers
None: grown for its foliage
Leaves
Fine texture, evergreen; dark green
Shape
Rounded, spreading
Hardy in
USDA zones 4 to 10
Light
Full sun, part sun, part shade
Soil
Average, evenly moist
Water
Moderate
Feeding
Light, in spring
Family
Aquifoliaceae
Comes from
SE USA
Attracts
Pollinators, bees, specialist bees, butterflies, songbirds
Host plant for
Henry's elfin
Stands up to
Rabbits, salt, wet soil, pollution, erosion

Checked against NC State Extension. Flowering times are for zone 5: later in colder zones, earlier in warmer ones. Toxicity and spread information is a general gardening guide, not veterinary or medical advice, and invasive status varies by region. If a person or pet eats a plant, contact poison control or a vet. Check your local invasive species list before planting anything with a spread warning.