Grape Fertilizer for Vines, Flowering & Fruit Set

When your grapevine may benefit from feeding

When a grapevine starts steady spring leaf and shoot development and tests show a nutrient need
When a developing vine is building canopy without excessive vegetative growth
When an established vine is developing fruit and nutrient monitoring points to a shortage
When a container-grown grapevine needs measured replenishment during active growth

Extra nitrogen can encourage excessive leaves at the expense of fruit; avoid late feeding that stimulates frost-sensitive new growth.

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.

Works for grape varieties

Concord
Thompson Seedless
Flame Seedless
Niagara
Muscadine
Scuppernong
Himrod Seedless
Catawba
Grape

Label facts

NPK 3-3.6-5.1 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 grapevines

Light

Full sun, seven to eight hours a day. Air movement through the canopy matters as much as light, so avoid crowded, shaded fence lines.

Water

Soak deeply about once a week for the first two years, then only in dry spells. Steady moisture early and drier conditions as fruit ripens give better flavor.

Soil

Deep, well-drained soil with a pH of 5.5 to 7.0. Grapes hate wet feet, so plant on a slope or a raised row where drainage is poor.

Feeding

Feed Grape Fertilizer from bud break through fruit set and into summer, mixed into your watering, then stop in late summer so your canes harden before winter.

Pruning

Prune hard in late winter while your vine is dormant, removing most of last year's wood. Fruit comes on shoots from one-year-old canes, so annual pruning matters.

Harvest

Taste rather than watch color, because grapes do not ripen further after picking. Pick when berries are sweet, seeds have turned brown and clusters come away easily.

Frequently asked questions

When should I feed grapevines?

Early spring at bud break, when your vine is pushing its first shoots, and again just after flowering, when the fruit has set and the vine starts sizing clusters. Grape Fertilizer is a liquid, so each feeding is available at those moments rather than releasing on its own schedule. Stop feeding by midsummer: late nitrogen keeps the vine growing leaves when it should be ripening fruit and hardening its wood before winter.

How often should I feed my grapevine?

Every 1–2 weeks in spring and early summer while your vine is actively growing, mixed into your regular watering at the recommended dilution. Grape Fertilizer is meant for light, steady feeding through that window rather than a single heavy application. Taper off by midsummer so the vine turns its energy to ripening and hardening its wood. In fall and winter a dormant vine needs very little, so every 4 weeks at most, and only if the vine is still active.

Will fertilizer help my grapes get sweeter?

It can help, within limits. Potassium supports sugar development and ripening, and Grape Fertilizer supplies it, so a vine that isn’t short on potassium has what it needs to sweeten its fruit. Two other things matter just as much: sunlight reaching the clusters, which is why growers thin leaves around the fruit, and not letting your vine carry more clusters than it can ripen. Feed steadily through early summer, then stop and let the vine concentrate on the fruit.

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

Yes. Grape Fertilizer is mixed at the same dilution for both; only the delivery changes. A watering can suits a container vine or a small bed, and a hose-end sprayer set to the recommended rate covers the root zone of established in-ground vines in one pass. A vine in a pot depends on feeding more, since each watering carries nutrients out of the container, so keep it closer to the regular schedule.

Will this burn my plants?

Grape 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 your vine. Mixed at the recommended dilution and watered in around the root zone every 1–2 weeks, the nutrients arrive in solution at a strength the roots take up as they water. If you ever overdo a mix, water the area thoroughly with plain water.

When will I see results?

Foliage answers first. Greener leaves and stronger shoot growth usually show within a few weeks of consistent feeding, since a liquid reaches the roots right away. The benefit Grape Fertilizer is built for takes the whole season: fuller clusters and better ripening depend on steady nutrition from bud break through early summer, sun on the fruit, and a sensible crop load, and they’re most visible at the next harvest.

Let's Start Growing!

Choose your size