Gardening on a budget in South Africa: plants and tricks that stretch a rand

Gardening has a reputation for being expensive, and it is, but only if you buy it the way a shop wants you to. Fill a trolley with seedlings, bagged soil and plastic pots on a Saturday and you will spend a serious amount of money on a garden that looks thin by March. Almost everything in that trolley has a cheaper version that takes a little more patience and gives a better result.

We see both approaches at the nursery. Some people build a garden in one weekend and replace half of it the following year, and some build it over two seasons out of seed, cuttings and swaps and end up with something that keeps improving. The second garden costs a fraction of the first. Here is where the money actually goes, and where you can stop it going there.

Seed instead of seedlings, but not for everything

A packet of seed costs roughly what a single tray of seedlings costs and contains many times more plants. For annuals, herbs, leafy greens, beans, sunflowers and anything you want in quantity, seed is the obvious answer. Marigolds, nasturtiums, cosmos and alyssum germinate readily and will self seed after the first year, which means you pay once and get them forever.

Seed is not always the right call. Tomatoes and peppers started too late in the season never catch up, and some perennials take two years to reach flowering size, so a seedling buys you a year. The honest rule is to sow anything fast and cheap and buy anything slow or timing critical. Our step by step seed starting guide covers the sowing depths and timing that make the difference between a full tray and an empty one.

Cuttings are free plants and most people are too polite to ask

The single biggest saving in any garden is propagation, and it costs nothing but a pair of secateurs and some patience. Pelargoniums root so readily that a snapped off piece pushed into damp soil will often take, and SANBI's profile of Pelargonium tomentosum notes how easily this whole indigenous group strikes from cuttings. Plectranthus, lavender, rosemary, coleus and most succulents behave the same way.

Timing helps. The RHS explains the technique for softwood cuttings taken from soft new growth in spring, and separately how hardwood cuttings work for woody shrubs in winter, when you can push a pencil thick piece into the ground and largely forget about it until spring. Between those two methods you can propagate most of what grows in a South African garden.

The social side matters too. Almost every gardener has something that needs dividing and nobody wants to throw it away. Ask the neighbour with the good agapanthus. A street where three people swap divisions and cuttings once a year effectively runs a free nursery, and the plants you get are already proven to survive your local conditions, which is worth more than any label.

Succulents multiply themselves while you watch

Succulents are the best value plants in the country. A single leaf laid on damp mix will grow roots, an offset snapped off a crassula will root within weeks, and a full pot of echeverias can come from one plant in a season. They also want very little water, which keeps them cheap to run.

The one thing worth buying properly is the growing medium, because succulents die in ordinary potting soil that holds water. A bag of Succulent Mix goes a long way when you are potting up small offsets, and it stops you losing the free plants you worked for. Our succulent care notes cover the watering rhythm that keeps them alive through a wet Highveld January.

Make compost, it is the biggest recurring saving

Bagged compost is the cost that never stops, because you use it every season, in every bed and every pot. Making your own turns kitchen scraps, lawn clippings and autumn leaves into the thing you would otherwise buy. The RHS guidance on making garden compost sets out the balance between green and brown material and the moisture level, which is really all there is to it.

It takes a few months and a bit of turning, and a heap in the sun in a Gauteng summer works faster than the books suggest. Keep buying a bag of Bark Compost for the jobs that need it right now, and let the heap cover the routine top ups. Within a year you will notice you are buying half of what you did.

Buy one good pot rather than five that crack

This is where budget gardening gets counterintuitive. Cheap plastic pots feel like the frugal choice, and they are, until the second summer, when the ultraviolet has made them brittle and one of them splits when you move it. Thin terracotta cracks in frost. Replacing pots every few years costs far more than buying properly once.

Our pots are hand cast from our Fibre Concrete Mix, which is fibre reinforced concrete built to stand in full sun, rain and Highveld frost without going anywhere. One good pot in a prominent position, planted well, does more for a garden than five small pots scattered around, and it is still there in ten years. If you are furnishing a garden slowly, buy one substantial pot a year rather than a set of small ones, and let the collection build.

Pot filler, the trick that halves the soil bill

Large pots swallow soil, and soil is heavy and expensive. You do not need the full depth of a big pot to be potting mix, because most plants root in the top portion of it anyway. Filling the bottom third with Pot Filler, which is broken concrete, cuts your soil requirement substantially, improves drainage, and adds weight low down where it helps stability in wind.

On a single big pot the saving is a bag or two. Across a patio of six large pots it is a meaningful amount of money, and the pots drain better for it. This is one of those quiet techniques that experienced gardeners use without ever mentioning it.

Plan first, buy second

The most expensive plants are the ones bought on impulse that turn out to want conditions you do not have. A shade lover in a west facing corner is money spent on a slow death. Sketch the garden, note where the sun falls at different times of day, and check what a plant actually needs before it goes in the trolley.

Our Garden Planner and Plant Compare tools are free and exist for this. Comparing two plants side by side on water, light and eventual size takes two minutes and saves the sort of mistake that costs a whole afternoon and a replacement plant.

Building a garden slowly out of seed, cuttings and home compost is genuinely cheaper, and it produces something more interesting than a trolley load ever will. Spend what you save on the one thing that has to last, which is the pot, and our range of hand cast concrete pots is made to be bought once.

Frequently asked questions

What is the cheapest way to fill a garden with plants?

Cuttings and division cost nothing. Pelargonium, plectranthus, lavender, rosemary and most succulents root easily, and swapping divisions with neighbours gives you plants already proven to grow in your area.

Is it cheaper to grow from seed or buy seedlings?

Seed is far cheaper per plant and works well for annuals, herbs, leafy greens and beans. Seedlings are worth the money for slow growers and for crops like tomatoes where starting late costs you the season.

How can I save money on potting soil?

Fill the bottom third of large pots with pot filler, which is broken concrete, so you need less mix. Making your own compost at home removes the biggest recurring cost, and it improves the soil you already have.

Are cheap plastic pots a false economy?

Usually. Plastic goes brittle in South African sun within a couple of summers and thin terracotta cracks in frost, so you pay again every few years. One properly cast concrete pot outlasts several rounds of replacements.

Which plants are the best value for a small budget?

Succulents, because a single leaf or offset becomes a whole pot within a season and they need very little water. Self seeding annuals like cosmos, nasturtiums and marigolds are the next best, since you buy the seed once.