Most of the vegetable garden operates on an annual cycle: you plant, you tend, you harvest, and at the end of the season, you start again. Rhubarb asks for something different. It requires you to plant once, wait two to three years before harvesting properly, and in return, it will occupy the same spot in your garden for fifteen years or more, producing reliably every season with relatively little effort. For gardeners with a corner of permanent ground to spare, it is one of the most rewarding long-term investments available.

The patience required is not passive. The first two seasons are about building root strength, and the management during this period directly determines how productive the plant will be for the decade that follows. Getting the site, soil, and early care right is the whole investment.

Choosing the right location

Rhubarb is a sun-lover that needs at least six hours of direct sunlight daily. In the warmer interior regions of South Africa, including Gauteng and parts of the Northern Cape, some protection from the most intense afternoon sun in midsummer is beneficial and prevents the large leaves from wilting under heat stress. In cooler growing regions, including the higher-altitude Western Cape, the Eastern Cape and the eastern Free State, full sun throughout the day is ideal.

Cold winters are not a problem for rhubarb; they are a benefit. The plant requires a period of cold dormancy to gather the energy reserves that produce a vigorous spring flush of stems. The Winelands, the highveld and inland areas with genuine winter cold consistently produce the best-quality rhubarb in South Africa. In frost-free coastal areas, the plant may grow adequately but typically produces more spindly stems without the dormancy period.

Because rhubarb stays in the same position for many years, think carefully about the site before planting. Choose somewhere not needed for seasonal cultivation or regular digging, and away from onions, garlic or other alliums, which inhibit its growth. Allow approximately one square metre per plant, and if planting more than one crown, space them at least a metre apart to accommodate their eventual size.

The soil that sets plants up for life

Rhubarb performs best in deep, loamy, well-drained soil rich in organic matter. It will not thrive in waterlogged conditions, and a planting site where water pools after rain should be avoided or addressed before planting. Dense clay soils can be improved significantly by incorporating generous quantities of well-rotted compost before planting. Sandy soils drain too freely for consistent rhubarb production and benefit from the same treatment.

Soil pH should sit between 6.0 and 6.8. This slightly acidic to near-neutral range is within the comfort zone of most productive garden soils, but it is worth testing if you are unsure, particularly on highveld soils, which can sometimes trend alkaline. Work compost into the planting area several weeks before planting and keep the crown well mulched with compost throughout its life: rhubarb is a heavy feeder that responds visibly to annual compost top-dressings each autumn.

Planting crowns rather than seed

Crowns, the dormant root sections sold by nurseries in late winter, produce harvestable stems much sooner than seed-grown plants and are the reliable choice for home gardeners. Plant crowns in late winter, once the worst frosts have passed, with the growing tip just level with or barely below the soil surface. Water the well and mulch around the crown to retain moisture and suppress weeds without covering the growing tip itself.

The first and second years are about restraint. Allow everything that emerges to grow unpruned in the first year, and take only a very limited number of stems in the second year, leaving the majority to photosynthesise and build the root system. From the third year onwards, harvest can begin in earnest, and the plant will continue to reward this patience for many seasons to come.

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