Rhubarb is a hardy, long-lasting perennial that’s easy to grow once established, and with a little care, it can keep producing for years. The best time to plant is in winter to early spring, when plants are available in garden centres or when dividing existing crowns.

Planting

Choose a sunny spot with good airflow and rich, free-draining soil. Before planting, dig in plenty of compost and add Garden Time Compost to build a strong nutrient base. Space plants around 80–100cm apart to give them room to spread.

Feeding and soil care

Rhubarb is a heavy feeder, so it needs regular top-ups to keep growing well. Feed in early spring and again in autumn with compost and organic fertilisers like Garden Time Chicken and Sheep Pellets to encourage lush new stems.

Watering and mulching 

Dry rhubarb plants will collapse quickly, especially in hot, dry regions like Canterbury. Keep your plants happy with regular deep watering during summer, and finish with a thick layer of mulch to lock in moisture and protect the roots. Explore our range of bagged mulch and bark products.

Harvesting and plant care

Pick outer stalks as needed, but even if you don’t plan to use them, removing mature stems helps the plant focus its energy on producing new growth. Only eat the stems. The leaves are toxic to both people and pets, so never feed them to animals, just toss them in the compost.

What to expect in winter

In colder parts of New Zealand, rhubarb can die back or look a bit scrappy during winter. Don’t worry, apply a side dressing of compost and pellets again in early spring and you’ll soon see fresh new shoots coming through.

When to replant

Rhubarb can last 4–5 years before needing to be divided or replaced, although some plants will keep going much longer if well cared for.