Holly care guide: when & how to prune, fertilize and spray

When: 4–10 weeks before the last spring frost.

• zones 3–5: about Mar 1 – Apr 12
• zones 6–7: about Feb 4 – Mar 18
• zones 8–10: about Dec 17 – Jan 28

Pruning while dormant keeps a neat shape. Holly buds lie along the stems, so it regrows from cuts.

1. Cut branches back to just above a leaf node or side branch, keeping the natural pyramidal shape.
2. Remove crossing branches and any reverting green shoots on variegated plants.
3. Overgrown hollies tolerate hard renewal pruning in late winter. They'll skip berries for a year.

Tools: Bypass pruners, Loppers, Leather gloves

When: from 1 week before to 3 weeks after the last spring frost.

• zones 3–5: about May 3–31
• zones 6–7: about Apr 8 – May 6
• zones 8–10: about Feb 18 – Mar 18

A single spring feeding as growth starts covers most shrubs for the year.

1. Scatter fertilizer at the label rate from near the stems out past the drip line, where the feeder roots are.
2. Water it in thoroughly.

What to use: 🌿 Organic acid-loving plant food (e.g. Espoma Holly-tone 4-3-4) · Acid-forming fertilizer (e.g. Miracid 30-10-10 or ammonium sulfate)

When: 2–6 weeks before the last spring frost.

• zones 3–5: about Mar 29 – Apr 26
• zones 6–7: about Mar 4 – Apr 1
• zones 8–10: about Jan 14 – Feb 11

Smothers overwintering scale insects before they hatch. It's the lowest-toxicity insect control you can do all year.

1. Pick a calm, dry day between 40°F and 70°F (4–21°C) with no freeze forecast for 24 hours.
2. Mix the oil at the label's dormant rate.
3. Coat every branch, crotch and bark crevice until it drips.
4. Spray before buds open. Oil on tender green tissue can burn it.

What to use: 🌿 Horticultural / dormant oil (e.g. Bonide All Seasons Oil)

Caution: Don't use within 2 weeks of a sulfur spray. Don't spray blue spruce or other blue conifers; oil strips their color.

When: 2–6 weeks after the last spring frost.

• zones 3–5: about May 24 – Jun 21
• zones 6–7: about Apr 29 – May 27
• zones 8–10: about Mar 11 – Apr 8

Mulch keeps roots cool and moist, suppresses weeds and slowly feeds the soil. Applying it after the soil warms lets roots wake up first.

1. Spread 2–3 in (5–7 cm) of mulch over the root zone.
2. Keep mulch 2–3 in (5–7 cm) away from stems and trunks. Mulch piled against bark invites rot and rodents.
3. Don't go deeper than 3 in (7 cm) in total. Too much mulch suffocates roots.

What to use: 🌿 Pine straw or pine bark fines (slightly acidifying) · 🌿 Shredded hardwood or pine bark mulch