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Strawberry Fertilizer

Feed your strawberries through their growing season with our liquid Strawberry Fertilizer, made for June-bearing, everbearing and day-neutral strawberries in beds, towers and containers. It supplies supplemental nutrition for the crowns, leaves, runners and fruit a strawberry patch produces. Mix it with water and apply around the root area.

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Free shipping1M+ Bottles SoldMade in Seattle

When your strawberries may benefit from feeding

  • When new strawberry plants are establishing leaves and roots in a bed with a documented nutrient need
  • When June-bearing plants enter their post-harvest renovation period and are actively rebuilding foliage
  • When day-neutral or everbearing strawberries continue growing and fruiting through a long warm season
  • When container strawberries are frequently watered and their limited root zone needs nutrient replenishment

For June-bearing strawberries, excessive nitrogen near harvest can favor leaves over fruit; use variety-specific timing and do not feed purely to correct poor pollination or drought stress.

Results you can see

supports healthy flowering and fruit development for plump, vibrant strawberries.

Supports healthy flowering and fruit development for plump, vibrant strawberries.

supports fresh leaf and runner growth for fuller, healthy-looking plants.

Supports fresh leaf and runner growth for fuller, healthy-looking plants.

supports healthy root development for effective water and nutrient uptake.

Supports healthy root development for effective water and nutrient uptake.

Works for strawberry varieties

  • Albion
  • Chandler
  • Seascape
  • Earliglow
  • Strawberry

How to use

  1. Watering can

    2 Tbs (30 mL) per gallon of water

    Spring & summer: every 1–2 weeks · Fall & winter: every 4 weeks

  2. Hose end sprayer

    Set dial to 1 oz (30mL) setting

    Apply every 1-2 weeks in spring and summer

  3. Leaf misting (optional)

    1 tsp per quart (32 oz) of water

    Spray on leaves every 1-2 weeks

What's inside
A 3.6-3-5.1 ratio weighted toward potassium, because strawberries are a fruiting crop first. Potassium at 5.1% does the heavy lifting during fruit set — it moves sugars into developing berries and controls how your strawberry plant manages water, which is what sizing and sweetness come down to. Nitrogen sits at 3.6%, all of it nitrate nitrogen — the form roots absorb directly, fast-acting with low burn risk — enough to build the leaf canopy that powers fruiting without pushing runners and foliage at the expense of berries. Phosphate at 3% supports flowering and the shallow, fibrous root system strawberries depend on.

Beyond NPK: sea kelp (Ascophyllum nodosum) for natural growth compounds, plus calcium at an unusually high 2.1% and 0.75% magnesium, with iron, boron, manganese, zinc, and copper. Calcium and boron are the two strawberries run short of first — calcium deficiency shows up as soft, poorly colored berries that break down fast after picking, and low boron causes lumpy, misshapen fruit from incomplete pollination and cell development.

Label facts

NPK 3.6-3-5.1 with 2.1% calcium and 0.75% magnesium, plus iron, manganese, zinc, boron and copper.

Derived from kelp (ascophyllum nodosum), potassium phosphate, potassium nitrate, calcium nitrate, magnesium nitrate, boric acid, copper sulfate, ferric sulfate, manganese sulfate, zinc sulfate.

One 8 oz bottle makes 8 gallons of feed at 2 Tbs per gallon — the 32 oz makes 32.

Store cool and dark. Guaranteed 12 months from purchase; keeps up to 2 years.

How to care for strawberries

Light

Eight or more hours of direct sun for sweet berries. Under six hours you get plenty of leaves, few flowers, and fruit that stays small and bland.

Water

Strawberries root shallowly and need one to two inches of water a week. Water at soil level, since wet foliage and wet ripening berries do not keep well.

Soil

Loose, well drained soil rich in compost, pH 5.5 to 6.5. Set the crown level with the surface: buried crowns rot and exposed roots dry out.

Feeding

Feed Strawberry Fertilizer every two to three weeks through the growing season in beds, pots and towers alike. Keep feeding June bearers after harvest while next year's buds form.

Harvest

Pick when the berry is red all over, in the cool of the morning, snipping the stem instead of pulling. Strawberries do not ripen further once they are off your strawberry plant.

Pruning

Pinch off runners on first year plants so energy goes into the crown. Renovate June bearing beds after harvest by mowing the old leaves and thinning your strawberries.

Frequently asked questions

How often should I feed strawberries?

Strawberry Fertilizer is built for steady feeding through the season, since strawberries grow, flower and fruit at the same time. Mix 2 tablespoons per gallon of water and apply every 1–2 weeks in spring and summer, then drop to every 4 weeks in fall and winter. A hose-end sprayer on the 1-ounce setting works for larger beds, and you can mist the leaves with 1 teaspoon per quart every 1–2 weeks if you like. Fold it into your normal watering and your strawberries in beds, pots and towers stay supplied.

Why are my strawberries so small?

Small berries usually have a cause outside nutrition worth checking first: crowded plants competing for light and water, too many runners draining energy from the mother plant, or poor pollination in cool, wet weather. Clip excess runners, thin crowded beds and keep watering consistent while the berries size. Once those basics are handled, Strawberry Fertilizer supports sizing directly: potassium at 5.1 percent moves sugars into developing fruit and manages your strawberry plant's water, and calcium and boron support firm, well-formed berries.

Why do I get lots of leaves but no berries?

Usually one of three things. Excess nitrogen from a lawn-type fertilizer pushes foliage over fruit; not enough sun holds back flowering, since strawberries want six or more hours of direct light; or it’s variety timing, because June-bearers fruit only once a season. Strawberry Fertilizer keeps nitrogen moderate and potassium high specifically to avoid feeding the leaf-heavy pattern, so your strawberry plant builds enough canopy to power fruiting without running to leaves and runners. It can’t compensate for shade, so check the light first.

Is this safe for strawberries I'm going to eat?

Yes. Strawberry Fertilizer is a plant nutrient made for edible crops, supplying the same minerals plants draw from any garden soil, taken up through the roots. Mix it at 2 tablespoons per gallon, avoid contact with skin and eyes while mixing, and rinse picked berries before eating as you normally would. The product itself is not for human or animal consumption straight from the bottle, so store it where children and pets can’t reach it.

Should I feed strawberries in their first year?

Yes, though the goal is different. First-year plants are building crowns and roots for future harvests, so many growers pinch off early flowers on June-bearers to redirect energy into establishment. Feed Strawberry Fertilizer on the normal schedule either way: the nitrogen supports the leaf canopy, the phosphate supports flowering and the shallow, fibrous root system, and calcium strengthens the developing crowns. Day-neutral varieties can be allowed to fruit lightly in their first season.

When will I see results?

Leaves first, berries on the next flush. All of the nitrogen in Strawberry Fertilizer is nitrate nitrogen, which roots absorb directly, so it begins working with the first application; expect greener leaves and stronger new growth within 1–2 weeks. Fruit results, in sizing and firmness, show on the next flush that develops under regular feeding, typically 3–5 weeks in, since berries already sizing were set before feeding began. Potassium supports the sugars and sizing, and calcium and boron support firm, well-shaped fruit.

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Strawberry Fertilizer Quart $14.98