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Thursday, 10 August 2017

Dividing Rhubarb


If you grow rhubarb in your garden or allotment you should be thinking about dividing it over the next few weeks if you haven't done it for a while. Rhubarb plants should be divided every five years or so giving you additional plants but also healthier ones too.

How to divide Rhubarb
Dig up the crowns and roots taking extra care not to damage the crown. Divide the roots into 4 to 8 pieces depending on the size of the plant you are lifting. It is best to divide the dormant crowns between two large buds called eyes so that at least a 5cm or so section of storage root is left attached to each bud. Remember to take care not to break off the delicate buds as these can easily be broken, but other that that the roots are actually pretty tough and can tolerate quite a lot of rough treatment. Small buds will give you small plants for the first few years after planting until the newly divided plant bulks up again, while four to ten new roots can usually be obtained from crowns that have been grown a few years.

Take care not to allow the divisions to dry out or to freeze if you are not to going to be planting the straight away. Remember that when you are dividing crowns for re-planting, it is a good idea to identify the most vigorous plants the previous summer and use these as planting stock in the Autumn. The depth of planting should be so that the top of the plant is at, or only just below the soil surface. Gently firm the surrounding soil and water the new plants in well. The space between plants should be approximately 75cm (30in) for smaller varieties, and up to 120cm (48in) for larger varieties. It is a good idea to identify where the newly divided crowns have been planted with a cane until new shoots appear above the soil surface in February or March.

It should be obvious but crowns from diseased plants should not be divided from.

Soil Preparation
All Rhubarb varieties develop a deep root system and will grow best in a fertile, partially shaded, free-draining soil. It is a good idea to prepare the ground in advance, start digging over your soil four weeks before planting and remove any stones you find and adding as much organic matter as possible.

Heres a useful video:

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