Start a small pesticide-free vegetable bed: sun, soil, water, first crops

If you want vegetables you know the story of, the most direct way is to grow them. The good news is that you don’t need land. A one-metre raised bed or a few pots can give you something to pick every week. This is the first lesson of the path “Start a pesticide-free kitchen garden”: choosing a spot, mixing soil, picking a first set of crops, and dealing with insects without pesticides.

On this site, “pesticide-free” means no synthetic pesticides and no synthetic fertiliser. It does not mean any organic certification.

Pick the spot: sun matters most

The number one problem for a new vegetable bed is not insects. It is too little sun. Plants short of light grow tall and thin, with weak leaves that catch disease easily.

Before you buy anything, watch the spot for a day. Note when direct sun reaches it and when it leaves.

Group	Direct sun per day (approx.)	Examples
Leafy greens	4-6 hours	water spinach, choy sum, lettuce
Leafy herbs	4-6 hours or more	holy basil, Thai basil, spring onion
Fruiting crops	6-8 hours	chilli, tomato, yardlong bean

Morning sun beats harsh afternoon sun. If you can, choose a spot that gets sun from morning to early afternoon and is close to a tap. Beds that need water carried a long way tend to get forgotten.

Potting soil you can mix yourself

Vegetables like loose, well-drained soil with plenty of organic matter. A common, simple mix is three things in equal parts by volume:

• Loam, or garden soil sieved of stones
• Compost, or manure that has been composted until it is cool and no longer smells
• Something to loosen it, such as rice husk or coconut coir

Never use fresh manure. Manure that has not been hot-composted can damage roots and carry germs onto vegetables we eat raw.

Example: soil for one raised bed

Say the bed is 0.5 m wide, 1 m long and 25 cm deep.

1. Volume = 0.5 × 1 × 0.25 = 0.125 cubic metres
2. 1 cubic metre = 1,000 litres, so this bed takes about 125 litres of soil
3. Split into three equal parts: about 42 litres each

Soil settles after the first watering, so add 10-20 per cent extra. A depth of 20-30 cm suits most leafy greens; fruiting crops like tomato prefer deeper soil.

Your first crops

For a first round, pick crops that are quick, tough and eaten often. Early results keep you going. Days in the table are approximate and depend on variety and weather.

Crop	Start from	Ready in about	Note
Water spinach	seed, soaked overnight	25-30 days	cut the tops and it regrows
Choy sum	seed	30-45 days	thin to about a palm’s width apart
Spring onion	shallot bulbs with roots	30-45 days	cut above the base; leaves regrow
Holy basil	seed or cuttings	45-60 days to first picking	pinch tips often for a bushy plant
Thai basil	seed or cuttings	45-60 days to first picking	remove flowers to keep leaves coming

A simple trick: sow a little every 1-2 weeks instead of the whole packet on one day. You get a steady supply rather than a glut and then nothing.

Watering: mostly in the morning

• Water in the morning so leaves are dry by night, which lowers the chance of fungal disease. In very hot weather you can water again in the evening, at the base, not over the leaves.
• Check with a finger. Push it 2-3 cm into the soil. If it is still damp, wait. Too much water rots roots just as surely as too little dries them.
• Mulch with a thin layer of straw, dry leaves or dry grass. It holds moisture, keeps weeds down and stops the soil from cracking.

Insects: pesticide-free is not pest-free

A bed that is never sprayed will always have visitors. The goal is not to kill them all, but to keep damage low enough that there is still plenty to eat. Methods that work without chemicals:

1. Walk the bed every morning. Turn leaves over; pick off caterpillars and egg clusters. Problems spotted early are far easier to fix.
2. Insect netting. Cover brassicas such as choy sum and Chinese kale from the day you plant. It keeps out the moths that lay eggs and flea beetles.
3. A strong jet of water knocks aphids off young shoots. Repeat every few days.
4. Mix your plantings. Don’t fill a bed with one crop, and tuck in strong-smelling plants such as lemongrass, holy basil and marigold. Insects find their target less easily.
5. Pull badly diseased plants and keep them out of the compost so the disease does not come back.

Natural extracts such as neem are still insecticides. If you use one, use it only when you really need to, follow the label, wear gloves, and wait as long as the label says before harvesting.

Common mistakes

• Sowing too thickly. Seedlings fight for light and food and the whole bed stays spindly. Thin them out.
• Wrong season. Lettuce in the hot season tends to bolt and turn bitter. Save it for the cool months.
• Watering every day without checking. Soil that is always soggy starves roots of air.
• Too much too soon. One bed looked after daily beats five beds left alone.

Start small, look every day. A bed you walk past each morning does better than a big one you visit once a week.

The next lesson makes compost from kitchen scraps, so the soil in your bed gets better every round.