Below are mini guides as to what other edible or useful plants you could grow in your windowbox with instructions on how to grow them and recommended cultivars that are known for their ease of growing, good flavour, size or hardiness.
The flowers of Nasturtium are edible and look great in a salad. The seeds can also be pickled and used to make poor man's capers. Make sure you choose dwarf nasturtium seed or otherwise the plant will sprawl out of control. Likes a moisture retentive soil in sun.
Sow seed: 2cm deep in late spring in flowering postition.
It might seem a nice idea to be able to grow your own nettle tea and provide a haven for wildlife, but nettles will take over your windowbox, so I wouldn't recommended them.
Usually grown as annual, Parsley does best in fertile, moisture retentive soil and is happy in sun or partial shade. Flat-leaved (or French) and Curly varieties are available.
Sow seed: In pots or modules indoors in spring. Seed can take several weeks to germinate.
Plant: Pot grown Parsley in late spring to early summer
Bush and prostrate varieties of Rosemary are ideal for a windowbox, though will need careful pruning to keep them down to size (only prune back to green material, not into woody, if you can help it). Rosemary likes a sheltered, sunny position in well-drained, fertile soil
Plant: Pot grown plants (Cuttings can be taken and propagated indoors)
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