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FROM: Weekend, 22 September 2018

Gardening — Monty Don

Monty’s plant of the week


There are two kinds of walnut that are readily grown in this country. Juglans regia (pictured), the English walnut, was introduced by the Romans. The other is Juglans nigra, the American species. This latter grows faster but does best in warmer, dryer conditions than my part of the country can offer and is far happier in alkaline soil such as chalk or limestone. You should never plant walnuts - and in particular Juglans nigra - in an orchard or near apple or pear trees. The roots give off a toxin called juglone that kills some plants. They should be planted alone or in groups.