How to Fertilize Strawberry

Fragaria x ananassa

Reviewed by Kiersten Rankel M.S.

Quick Answer

Use a balanced 10-10-10 fertilizer at planting and in early spring. Switch to a low-nitrogen, higher-potassium formula like 5-10-10 once flowers appear. Feed every 3 to 4 weeks during the growing season.

When Should I Start Feeding My Strawberry Plants?

Begin feeding when new green leaves push up from the crown in early spring, adjusting your start date based on local frost patterns since Strawberries grow across zones 3a through 10b.

Pacific Feb–Oct

Mountain May–Sep

Midwest Apr–Sep

Northeast Apr–Sep

Southeast Mar–Oct

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How Often Should I Fertilize My Strawberry Plants?

Feed strawberry plants every 3 to 4 weeks during the growing season. Start when new leaves emerge in early spring and continue through the last harvest.

For June-bearing varieties, give one final feeding after the last harvest to help the plants build energy for next year's crop. Everbearing and day-neutral types benefit from continued feeding through their extended fruiting period.

Stop fertilizing about 4 weeks before the first expected frost. Late nitrogen encourages tender growth that will not survive cold weather.

Feeding Calendar

Spring

Balanced 10-10-10 at green-up, then every 3–4 weeks

Summer

Low-nitrogen formula (5-10-10) every 3–4 weeks through harvest

Early Fall

One post-harvest feeding for June-bearers, then stop

Late Fall & Winter

No feeding

What Is the Best Fertilizer for Strawberry Plants?

Strawberry plants need different nutrition at different stages. In early spring, a balanced 10-10-10 fertilizer supports healthy leaf and root development as the plants wake up from dormancy.

Once flower buds appear, switch to a formula lower in nitrogen and higher in phosphorus and potassium, like 5-10-10. Too much nitrogen at this stage produces lots of runners and leaves but fewer, less flavorful berries.

Granular fertilizer works best for garden beds, while liquid is easier for container strawberries. Whichever you choose, keep the fertilizer off the crown of the plant where the leaves emerge.

Synthetic

Osmocote Smart-Release 14-14-14

Slow-release granules that feed for up to 4 months. Good for the early-season balanced phase. Sprinkle around plants at planting time.

Jack's Classic Blossom Booster 10-30-20

High-phosphorus water-soluble formula for the fruiting phase. Mix 1 tablespoon per gallon and apply every 2 weeks once flowers appear.

Organic

Dr. Earth Flower Girl Bud & Bloom Booster 3-9-4

Organic granular with high phosphorus for fruit and flower production. Apply around strawberry plants once buds form.

Espoma Berry-tone 4-3-4

Organic granular designed specifically for berries. Contains beneficial soil microbes. Apply every 4 weeks during the growing season.

How Do I Fertilize My Strawberry Plants?

Water the bed first

Soak the soil around your strawberry plants before fertilizing. Applying fertilizer to dry soil can burn the shallow root system.

Measure carefully

For granular 10-10-10, apply about 1 pound per 100 square feet of bed space. For container plants, use a liquid formula at the label rate.

Keep fertilizer off the crown

Scatter granules between the plants, not on top of them. Fertilizer sitting in the crown where new leaves emerge can cause rot and burning.

Water in after applying

Give the bed a light watering to wash granules off any leaves and into the soil. This also helps dissolve the nutrients into the root zone.

Switch formulas at bloom time

When you see the first white flowers, change to a fertilizer with less nitrogen and more phosphorus and potassium. This shift directs energy toward fruit instead of foliage.

Got More Questions?

Can I use banana peels to fertilize my strawberry plants?

Banana peels decompose very slowly in soil and do not release significant nutrients to your plants. They can attract pests. Use a proper berry or vegetable fertilizer instead.

What happens if I over-fertilize my strawberry plants?

Too much fertilizer, especially nitrogen, produces lush green foliage and lots of runners but very few berries. The fruit you do get may taste bland. Excess salts can also burn the shallow roots.

Should I fertilize strawberry plants during fruiting?

Yes, but switch to a low-nitrogen formula higher in phosphorus and potassium. Feeding during fruiting supports berry size and sweetness. Just keep the fertilizer away from the fruit itself.

Do first-year strawberry plants need fertilizer?

Yes. Apply a balanced fertilizer at planting and continue feeding through the first growing season. For June-bearing varieties, pinch off first-year flowers so the plant invests that energy into building a strong root system for next year.

Can I use the same fertilizer for strawberries and my vegetable garden?

A general vegetable garden fertilizer works fine in early spring. But once flowers and fruit appear, strawberries benefit from a formula with less nitrogen and more phosphorus than most veggie fertilizers provide.

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About This Article

Kiersten Rankel M.S.

Botanical Data Lead at Greg · Plant Scientist

About the Author

Kiersten Rankel holds an M.S. in Ecology & Evolutionary Biology from Tulane University. A certified Louisiana Master Naturalist, she has over a decade of experience in science communication, with research spanning corals, cypress trees, marsh grasses, and more. At Greg, she curates species data and verifies care recommendations against botanical research.

See Kiersten Rankel's full background on LinkedIn.

Editorial Process

Fertilizer recommendations verified against Fragaria x ananassa growth data from Greg's botanical database, cross-referenced with USDA hardiness zone data and published horticultural research.

2,640+ Greg users growing this plant

USDA hardiness zones 3a–10b

Citations:
NC State Extension
Royal Horticultural Society

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