It should be suitable not only for the courtyard, but also for the climate characteristics of your area. For example, many garden plants in the south can't be planted in the north, and so on. Just a few examples for reference:

1. Herbs: day lilies, especially day lilies, are edible and can be used for greening and beautifying. Ophiopogon japonicus, very easy to survive, don't spend too much energy. Iris plants should not be raised more, but a few clumps can be raised appropriately. etc

2. Vines: wisteria, lingxiao, roses, etc.

3. Woody: Osmanthus fragrans, Cinnamomum camphora, Lagerstroemia indica, etc.

In addition, there are peony, peony, Chinese rose, etc. As long as they are suitable for the climate characteristics of their own regions, what they like is the best.