How to Grow a Walnut Tree From a Walnut Step 1. It can grow to about 30m (100ft) high and 18m (60ft) wide. While there are several species of walnut, most notably the black walnut and English walnut, basic planting and care instructions are all similar. Almond must be cross pollinated by another variety. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/c\/c7\/1555191-1.jpg\/v4-460px-1555191-1.jpg","bigUrl":"\/images\/thumb\/c\/c7\/1555191-1.jpg\/aid1555191-v4-728px-1555191-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"

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