Raspberry Fertilizer for Flowering & Berries

Raspberry Fertilizer

Help your raspberry plants build healthy leaves, productive seasonal growth, and the new canes that keep a berry patch developing. Our liquid Raspberry Fertilizer fits into watering for rows, raised beds, and larger containers when supplemental nutrients are needed. It's designed for growers managing both fruit-bearing canes and fresh replacement growth throughout the active raspberry season.

Free shipping1M+ Bottles SoldMade in Seattle

When your raspberry may benefit from feeding

When new raspberry canes and leaves emerge in spring

When a productive planting continues growing replacement canes after harvest

When a container raspberry loses nutrients through repeated watering

When a soil test shows nutrient needs after cane crowding and moisture are addressed

Pruning depends on summer-bearing versus fall-bearing canes; extra feed cannot correct poor pollination or cane disease

Results you can see

Feeds foliage for deeper color and a brighter, more lively look.

Encourages fresh leaf and stem growth for a fuller, thriving plant.

Supports healthy, resilient roots that absorb nutrients more effectively.

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 raspberries

Light

Full sun, six to eight hours a day, for the sweetest fruit. A little afternoon shade helps in hot climates, but heavy shade means fewer and smaller berries.

Water

One to two inches of water a week, and more while the berries are filling. Water at the base with a soaker hose, since wet foliage invites fruit rot.

Soil

Well drained soil rich in compost, pH 5.6 to 6.5. Raspberries hate wet feet, so plant on a low ridge in heavy clay and mulch to keep the roots cool.

Temperature

Most varieties are hardy well below zero and want a cold winter rest. Heritage and other everbearers handle a wider range of climates and keep cropping into fall.

Feeding

Feed Raspberry Fertilizer every two to three weeks from the time canes break dormancy in spring through harvest, then stop so new growth hardens off before cold weather.

Pruning

Summer bearing canes fruit in their second year, so cut those canes to the ground after harvest. Everbearers can be mowed down in late winter for one big fall crop.

Frequently asked questions

When should I fertilize raspberries?

Raspberry Fertilizer earns its place at two points. Feed in early spring as new canes emerge, when your raspberry cane is building the growth that carries the summer crop, and continue through harvest. For everbearing types, feed again after the summer picking to support the canes that produce the fall crop. Ease off in late fall so your canes harden before winter rather than pushing soft growth into the cold; a raspberry that goes into winter still growing is the one that suffers dieback.

How often should I feed my raspberry?

Every 1–2 weeks in spring and summer while your canes are actively growing and fruit is sizing up, then every 4 weeks in fall and winter as your raspberry cane slows. Raspberry Fertilizer is a liquid, so it mixes into the watering you’re already doing at the recommended dilution and reaches the whole root zone at once. Steady, light feeding suits raspberries better than an occasional heavy dose, since your plant draws on nutrients continuously from spring growth through the second harvest.

Why are my raspberry leaves pale?

Usually one of two things: a nitrogen shortage, which shows as even paling that starts on older leaves, or iron chlorosis in alkaline soil, which shows as yellow leaves with green veins on new growth. Raspberry Fertilizer addresses both with regular feeding, since the formula includes micronutrients along with the main nutrients, and your canes green up on the growth that follows. In high-pH beds, mulching with pine needles or compost helps over time by nudging the soil toward the range where iron stays available.

Can I use it on potted and in-ground plants?

Yes. Raspberry Fertilizer uses the same dilution for both, so it feeds a patio container and a row of Heritage canes from one bottle. A watering can suits pots and small beds; a hose-end sprayer set to the recommended rate covers larger in-ground plantings in one pass. Potted raspberries run short sooner because every watering carries nutrients out the drainage holes, so keep them on the regular spring and summer schedule rather than stretching the gaps.

Will this burn my plants?

Raspberry Fertilizer is a dilute liquid feed, and dilution is what matters here. Fertilizer burn happens when concentrated salts sit against the roots: too much product in too little water, or granules piled at the base of a plant. Mixed at the recommended dilution and applied every 1–2 weeks in season, the nutrients arrive in solution at a strength the roots take up as they water. Keep to that mix and apply it as part of a normal watering. If you ever overdo it, flush the soil with plain water.

When will I see results?

Foliage responds first. With regular feeding, greener leaves and stronger new cane growth usually show within a few weeks, because nitrogen goes straight into leaf color and extension. The fruiting benefit builds more slowly: Raspberry Fertilizer supports the flowering and fruit set that happen over the season, and on everbearing types your canes you feed after the summer picking carry the fall crop. Expect the clearest difference in berry size and quality at the next harvest rather than the next week.