Here's how to make a free fertiliser with pesky nettles ...

Stinging nettle (Urtica dioica) lives up to its name. Brush against the pesky plant, and you’ll instantly know you’ve encountered it. A run-in with stinging nettle leaves skin red and fiercely itchy.

We get a lot of physical samples brought into the office between soil, water, insects, plants and weeds. Sometimes it is a weird-looking bug that sparks someone’s curiosity. Other times the sample is ...