GRADE 8 Agriculture CROP PRODUCTION – Square foot gardening Notes

Square Foot Gardening

Subject: Agriculture — Topic: CROP PRODUCTION — Subtopic: Square foot gardening
For learners in Kenya (age 13). Simple, small-space garden method using a grid of 30 cm × 30 cm (about 1 ft × 1 ft) squares.

What is it?

Square foot gardening is a way to grow many vegetables in a small raised bed divided into equal squares. Each square is planted according to the size of the crop. Good for school gardens, homes in towns, and small farms.

Why use it? (Benefits)

• Uses small spaces well — ideal for compounds and school yards.
• Less weeding and less water needed.
• Easy to plan and easy to care for.
• Good for learning and quick harvests (vegetables for family meals).

Materials you need (cheap and available)

• A raised bed frame — 4 ft × 4 ft (about 1.2 m × 1.2 m) is common. You can also use wooden boxes, tyres, or buckets.
• Strong string and wood sticks or thin slats to make a 4 × 4 grid (16 squares).
• Soil mix (see below), seeds or seedlings, watering can.
• Compost or well-rotted manure, coconut coir or local leaf-mould, coarse sand or perlite (if available).

Good soil mix (Mel’s Mix made simple)

Aim for a light, fluffy mix that keeps water and supplies nutrients. A common mix (by volume):

• 1/3 compost (well-rotted farmyard manure or compost)
• 1/3 coconut coir or leaf-mould (peat moss can be used if available)
• 1/3 vermiculite or coarse sand/perlite (to hold air and water)

If vermiculite/perlite is not sold nearby, use coarse river sand mixed well so it drains but does not compact.

Bed size and grid

A 4 ft × 4 ft (≈1.2 m × 1.2 m) bed divided into 16 squares (each ≈30 cm × 30 cm). Here is a simple visual of a 4×4 bed:

Note: numbers (1, 4, 9, 16) show how many plants fit in one 30×30 cm square. Adjust depending on variety and seed packet instructions.

How to make a simple square foot bed (step-by-step)

1. Choose a sunny spot (at least 5–6 hours sun). If hot, a little afternoon shade is okay for leafy vegetables.
2. Build a box 1.2 m × 1.2 m (or use any box). Height 15–30 cm is fine.
3. Fill with your soil mix (Mel’s mix or similar).
4. Make a grid with string and sticks so you have 16 equal squares (or tape wood slats across).
5. Plant seeds or seedlings according to the number per square.
6. Water gently after planting and mark what you planted in each square.

Watering and care (Kenyan climates)

• Water in the morning so leaves dry in the sun — reduces disease.
• Seedlings need daily water at first; established crops need less often but deeper watering.
• Mulch with grass or dry leaves to keep moisture in and stop weeds.
• Use compost tea or small amounts of NPK fertiliser if plants look pale (follow instructions on pack).

Pests and safe control

• Common pests: caterpillars, aphids, slugs/snails in wet areas.
• Handpick big pests (caterpillars) and drop into soapy water.
• Use neem leaf spray or mild soap spray (1 tsp dish soap in 1 litre water) for aphids — test on one leaf first.
• Avoid strong chemicals in small gardens where you eat the food. Wash vegetables well before eating.

Harvesting and tips

• Leafy vegetables (sukuma, spinach) can be picked leaf by leaf — this gives many harvests.
• Root crops (carrots, radish) are ready when they reach expected size; pull gently.
• Rotate crops each season — do not plant the same family in the same square every time.
• Keep a small notebook: note planting date, watering, and when you harvested.

Ideas for Kenya (what to plant)

Good choices for Kenyan home/school gardens: sukuma wiki (kale), spinach, managu, tomatoes, capsicum, green beans, carrots, onions, herbs (cilantro, parsley), and small indigenous vegetables. Plant with the rain seasons in mind: plant before long rains (Masika) or short rains (Vuli), or irrigate during dry seasons.

Safety and hygiene

• Wear gloves when handling compost and manure.
• Do not use fresh (raw) manure directly on crops; compost it first.
• Wash hands and vegetables before eating.

School activity (simple project)

Make a 4×4 bed with your class. Assign groups to care for rows, measure growth each week, and record results. Use the produce for the school kitchen or take home.

Want a printable version or a simple planting calendar for your county in Kenya? Tell me your county and I can make one for the right planting months.