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Vegetable Fertilizer Guide


Fertilizing your vegetables at the appropriate time will keep your plants healthy and producing fruit. There are many types of fertilizers to choose from as well as many natural fertilizer around the house. Be careful to not over fertilize which can lead to heavy foliage without much fruiting.


We always recommend using organic fertilizer whenever possible. When we say 10-10-10 that is the ratio of Nitrogen (N)-Phosphorus(P)-Potassium(K) in the fertilizer. Nitrogen provides plants with the ability to produce more chlorophyll thus making foliage grow quickly. Phosphorus aids in root development, bloom size and quantity. While Potassium does many things like protecting from disease, aiding root development and increase photosynthesis. All are important factors throughout the life of most vegetables.

VegetableBefore PlantingAfter Planting
Asparagus
Mix organic matter in with soil at time of planting. Add 5 lbs of bone meal per 100 sq. ft. of asparagus.

Spring and fall side-dress with 3 lbs of 10-10-10 fertilizer.
Beans
If necessary use 1 lb. of 5-10-10 per 100 sq. ft.

Side-dress each plant with 1/2 oz. of 5-10-10 every 4 weeks until harvest is over.
Beets
Work aged compost into soil. If not available work 4 cups of 5-10-10 fertilizer into every 20 ft. row.

If growing slow add 2 cups of 10-10-10 into every 20 ft. row.
BroccoliAdd 3 lbs. of 5-10-10 per 100 sq. ft.

Side-dress 1 month after transplanting with high nitrogen fertilizer such as urea or ammonium sulfate.

Brussel SproutsWork 2-4 lbs of 5-10-10 per 100 sq. ft.
Add 1-2 lbs of 5-10-10 every month to every 100 sq. ft.

Cabbage
Mix organic matter or old manure into soil. Or add 3-4 lbs. of 5-10-10 per 100 sq. ft.

4 weeks after transplanting add 4 lbs. of 10-10-10 per 100 sq. ft.
Carrots
Add 1 lb. of 5-10-10 to every 50 ft row of carrots.

At 6" tall add a fish fertilizer as a side-dressing. Add a thin layer of hardwood ash for sweetness.
CeleryAdd compost the fall before.
Side-dress every few weeks with a manure tea or 1 tsp. 5-10-10 per plant.

CornWork 3-5 lbs of 5-10-10 per 100 sq. ft.
When 8" tall apply 2 lbs. of urea or ammonium sulfate per 100 sq. ft. When silk appears add 2 lbs of superphosphate.

CucumbersAdd compost or well rotted manure.
When vines begin to run add a handful of 5-10-10 fertilizer to every plant.

Eggplant
Use manure or add 3 lbs of 5-10-5 fertilizer per 100 sq. ft.

When fruits begin to appear add 2 lbs. of 5-10-5 per 100 sq. ft.
Lettuce
Work 4 lbs of all purpose 10-10-10 fertilizer per 100 sq. ft.


When lettuce reaches 10" add a side-dressing of fish or seaweed fertilizer. If not available add 1 lb. of 10-10-10 per 100 sq. ft.

MelonsUse old manure or compost.
Add 5 lbs of 5-10-10 fertilizer for every 100 sq. ft when vining begins. Again when fruits begin to appear.

Okra2 lbs of 10-10-10 per 100 sq. ft. of okra
Side-dress with 2 lbs of 10-10-10 per 100 sq. ft. when 10" tall, when pods appear, and one month later.

Onions
5 lbs of all purpose 10-10-10 per 100 sq. ft.

Twice add 5 lbs of 10-10-10 fertilizer once when 6" tall and again when onions begin to bulb.
Parsnips
Add 2 lbs of a 5-10-10 fertilizer 1-2 weeks before planting.

When foliage reaches 6" tall add 2 lbs. of 5-10-10 fertilizer
Peas
A week before planting add 2 lbs of 5-10-10 per 100 sq. ft.

After first harvest apply 1 lb. of 5-10-10 to every 100 sq. ft.
Peppers
Add 2 lbs. of 5-10-10 per 100 sq. ft.

Once a month add 1 lb. of 5-10-10 fertilizer to every 100 sq. ft.
Potatoes
Thoroughly mix 4 lbs. of 5-10-10 fertilizer into every 100 sq. ft. of potatoes

4 weeks after emerging add 4 lbs of 5-10-10 or a mixture of compost, seaweed and fish emulsion
Pumpkins
Mix old manure and 3 lbs of 5-10-10 fertilizer in every 100 sq. ft.

When vines begin to sprout add another 3 lbs of 5-10-10 fertilizer
Radish
Nothing

Nothing
Rhubarb
Give each plant 1/2 cup of 5-10-10 in early spring.

After harvest add another 1/2 cup of fertilizer to help root growth.
Spinach
Use 1 lb. of all purpose 10-10-10 for every 100 sq. ft. of spinach

Nothing
Squash
Add compost or 3 lbs of 5-10-10 fertilizer into every 100 sq. ft.

Add 3 lbs of 5-10-10 again when 1' of growth and again when fruits begin to appear.
Tomatoes
Add 3 lbs. of 5-10-10 organic fertilizer per 100 sq. ft. of tomatoes

Side-dress once with 2 lbs of 5-10-10 when fruit begins to set and again after first harvest