Green spinach leaves in wood-chip mulch, with yellowing outer leaves.
Photo: Forest and Kim Starr · CC BY 2.0. Source caption: “leaves and form”. Cropped for display.
Plant Care Steps · Growing guideplantcaresteps.com/plants/spinach/

Vegetables · A patio or balcony in cool weather

Let’s grow
spinach.

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Spinacia oleracea

This plan is for Leaf spinach

Light: Use a sunny spot; give afternoon shade when days warm up.

Planting steps ↓
Shopping amounts for this pot

TAKE THIS TO THE GARDEN CENTER

Buy 1 × 1 cu ft bag.

1 cu ft
ORGANIC POTTING MIX1 bag

Leave room at the rim.
Keep spare mix.

Bag-count illustration; not retail packaging. Match the product name and size below.
Look for this bag
Miracle-Gro Organic Potting Mix (US)1 cu ft bag · about 28.3 L · SKU 78951430
Mix to budget for
Budget up to 26 L (0.92 cu ft).

Worked example: a straight-sided planter with INSIDE dimensions of 12 × 12 × 12 inches, filled to 1 inch below the rim. A tapered pot or nursery starts use less fresh mix. If your planter is deeper, check its capacity before buying.

Before adding fertilizer: Fresh mix includes starter nutrients. Skip extra fertilizer at planting. Follow the feeding directions on your actual bag; “up to 2 months” is not a guaranteed waiting period. Do not combine the starter program with another full feed.

If your pot is a different size

Before planting, measure loose mix into the empty pot with a marked 1 US gallon container, up to the intended fill line. Record the volume, then remove enough mix to fit the nursery root ball. A nursery pot marked “#3” or “trade gallon” is not a measured US gallon. Leave space for watering; keep spare mix for later.

Use the bag’s cubic feet or liters to compare volumes. A dry quart on a soil bag is larger than a liquid quart on a measuring jug.

Compare all four starter shopping lists →

YOUR SIMPLE GROWING PLAN

One pot. Here’s the plan.

Before you start Start outdoors during a cool spring or fall spell; summer heat can make spinach flower before you get many leaves.

What you need · pot, mix & supplies
  • One draining planter, 12 inches square and 12 inches deep inside for this shopping allowance
  • 8 spinach seeds, or 4 small nursery transplants
  • Buy 1 × 1 cu ft bag. Miracle-Gro Organic Potting Mix (US). A watering can; keep any leftover mix.

The soil

Miracle-Gro Organic Potting Mix (US), 1 cu ft bag, SKU 78951430. Includes starter nutrients; follow the current bag’s feeding directions.

A patio or balcony in cool weather. Start with seeds.

THE POT12 × 12 × 12 in.

One square planter with drainage holes. The shopping calculation uses inside dimensions.

HOW MANY8 seeds → 4 plants

Two seeds per spot, in a 2 × 2 grid, 6 inches apart.

See the planting illustration
Illustrated starting setup: 12 × 12 × 12 in.; 8 seeds → 4 plants.
12 × 12 × 12 in. · 8 seeds → 4 plants One square planter with drainage holes. The shopping calculation uses inside dimensions. Two seeds per spot, in a 2 × 2 grid, 6 inches apart. Original illustration; not to scale.
  1. 01

    Fill and wet the mix

    Leave 1 inch below the rim. Water gently so the mix is evenly damp.

  2. 02

    Plant four little pairs

    Place 2 seeds in each of 4 spots, 6 inches apart. Cover with ½ inch of mix.

  3. 03

    Keep the surface moist

    Check each morning. Add a gentle sprinkle whenever the surface starts drying.

  4. 04

    Give each plant room

    When seedlings have 3–4 true leaves, snip the weaker plant at each spot. Keep 4 plants.

Other ways to start
Use nursery starts+

Plant 4 small spinach starts at the same 6-inch spacing. Keep each root ball intact and plant at its existing soil level. Direct sowing avoids transplant disturbance.

YOUR EVERYDAY ROUTINE

Water & fertilizer at a glance.

Water when
Check each morning. Water as the mix starts drying; wait if damp. Wet the root zone and let excess drain. Empty the saucer or outer pot after draining.
Fertilizer
Miracle-Gro Water Soluble All Purpose Plant Food (US 24-8-16)
Amount
1½ tablespoons in 1½ US gallons of water
What that amount covers
Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on.
How often to feed
Every 14 days during active growth.
When to start or pause
Skip extra feed at planting. Follow your potting-mix bag’s starter-feeding directions before adding this routine; “up to 2 months” is not a fixed waiting period. Feed only while actively growing. A short crop may finish without extra feed.
Product directions ↗

Use level measures and the exact US formula shown. If your label differs, follow it; do not transfer this dose to another formula or combine feeding programs.

See the watering & feeding illustrations
A soil check followed by slow root watering and free drainage.
Check before watering. Check each morning. Water as the mix starts drying; wait if damp. Wet the root zone and let excess drain. Original illustration; not to scale.
Fertilizer measure for Spinach: 1½ tablespoons in 1½ US gallons of water. Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on.
1½ tablespoons in 1½ US gallons of water Mix into water. Apply only enough solution to wet this pot and drain; the mixing batch is not the amount to pour on. Every 14 days during active growth. Skip extra feed at planting. Follow your potting-mix bag’s starter-feeding directions before adding this routine; “up to 2 months” is not a fixed waiting period. Feed only while actively growing. A short crop may finish without extra feed. Original illustration; not to scale.
Illustrated reference for Miracle-Gro Water Soluble All Purpose, US 24-8-16; not actual packaging.

US PRODUCT REFERENCE

Miracle-Gro

Water Soluble All Purpose

24-8-16

Soluble: mix into water

Check the official US product ↗

Illustrated reference; check the manufacturer’s current packaging and US label.

Sprouting and picking leaves
03 / WHAT HAPPENS NEXT

Look for sprouts in about 7–10 days when the soil is 55–65°F. Start picking outside leaves when they are big enough for your kitchen.

Choose a cool sowing window

Choose a cool spell in spring or fall. Hot weather and lengthening days encourage bolting; a city-specific planting date comes from your local Extension office.

For regional planting windows, find your local Cooperative Extension office ↗.

Something looking off?

My spinach is growing a tall flower stalk.+

It is bolting. Pick the usable leaves now, then start a fresh crop in cooler weather. More fertilizer will not reverse flowering.

Can I grow spinach from a cut stem?+

Use seeds or nursery transplants for this plan. A grocery-store spinach leaf is not a reliable way to start a crop.

Do I need acidic fertilizer?+

No. Do not add an acidifier just because the plant needs nutrients. Fertility and soil acidity are different questions.

Spacing and harvesting
Space and thin the seedlings

This is an intentionally simple container recipe: a 12-inch square pot, four planting positions, and two seeds per position before thinning. The pot size and spacing follow RHS guidance; the four-position layout is our editorial adaptation, not a tested yield claim.

Pick outer leaves and resow after bolting

Harvest outer leaves and leave the growing center intact. If the plant bolts or the leaves become bitter, finish the crop and sow again when conditions cool.

Help with your next step.

Sources, dates & detailed PDF

Editorial plans, not results from a Plant Care Steps growing trial. Compiled with AI assistance; they have not yet had an independent horticultural review. Editorial approach.

Something needs updating? Suggest a correction

Published · Updated

By jennyzhuang

Sources checked View sources ↗

Detailed PDF ↓

Full reference edition with expanded explanations and illustrations. Its publication dates appear in the file.

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Soil: Miracle-Gro Organic Potting Mix (US), 1 cu ft bag, SKU 78951430. Includes starter nutrients; follow the current bag’s feeding directions.

By jennyzhuang

Sources checked View sources ↗

Published · Updated

Read the online Sources section for linked references and the full reference PDF.

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Plant Care Steps · Care card

Spinach

Spinacia oleracea

Water
Check each morning. Water as the mix starts drying; wait if damp. Wet the root zone and let excess drain.
Light
Sun or light shade. Use a sunny spot; give afternoon shade when days warm up.
Temperature
Cool weather. A patio or balcony in cool weather
Common problems
My spinach is growing a tall flower stalk.. It is bolting. Pick the usable leaves now, then start a fresh crop in cooler weather. More fertilizer will not reverse flowering.