Gardeners told to do one simple job with rhubarb plants before winter arrivesRhubarb is a cool-weather crop that will bolt, producing flowers rather than thick, juicy stems, in hot conditions. ‌Dividing rhubarb crowns becomes straightforward once you understand the exact requirements, and it's remarkably simple, according to Caledonian Horticulture. The gardening specialists explained: "Dividing rhubarb plants every five to seven years is essential to maintaining their health and productivity. Given that November is considered late autumn in the UK, there's plenty of time to tend to your rhubarb plants. To divide your rhubarb crowns, locate them and use a sharp spade or knife to divide them into sections.