Some of the easiest perennials to add are herbs. Things like mint, oregano, chives, sage and thyme will do well just about anywhere. The only warning is that mint can get quite large. Many plant mint in planters, or you can plant it into a container that then gets mostly buried in the ground. By leaving an inch of the pot above the ground, it will discourage the mint from spreading so rapidly. If you love mint and use it a lot, just plant it in the ground and enjoy its rapid spreading.
Rhubarb is a classic perennial. It's beautiful large leaves and red stalks will be with you for years. It can be divided easily and passed along to other gardening friends as well. Mine will be made into some rhubarb crisp bars this afternoon.
To go along with that rhubarb, you could plant some strawberries. Whether in a strawberry pot, or in a bed, strawberries will be one of the most cherished perennials in many gardens. Every year we wait anxiously for them to ripen. Most don't make it into the house, but are eaten right in the garden, still warm from the sun.
Garlic and onions can also be a form of perennial. Garlic can be replanted in the fall and grown for the following year. I've been planting the same batch of garlic back for 4 years now. With the addition of potato onions which are a perennial, we will have plenty of our favorite seasonings for years to come.
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