Chard can grow enormous for a long period of time, if you want that, give it more space! But keep the spacing smaller for more frequent picking of smaller leaves. Be careful for leaves spreading out and growing onto your paths, chard and beetroot are popular with sparrows - something about the redness of stem of the leaf apparently so you must protect them.

This is a great crop that grows really fast into something to eat! May is a great time to grow chard, the colder conditions will make it think its winter and the growing will slow.

Medium size leaves 30 cm spacing fills quite a big area quite quickly
Putting chards in twos and threes as you’ll always get weaker ones