Plants that keep growing season after season makes a lot of sense to me. Perennials are the most rewarding plants in your garden, where they earn their keep with very low maintenance.
In my Melbourne garden I have experimented with some plants and discovered that they can be grown as perennials, although in general they are annuals.
Kale, Broccoli. Silver beat (Swiss Chard) and Capsicums can be grown as perannials, by cutting them back sightly at the end of the season.
With herbs Oregano, Thyme. Rosemary keep growing year after year. Parsley would self seed and you will have more plants without even lifting a finger.
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