The word "hardy" means strong, tough, and able to withstand difficult conditions or situations. It describes someone or something that is resilient and durable. Full definition
You can include a variety of hardy plants which will add color and a natural feel to your patio or terrace, without decreasing the space available. (uniquejunktique.com)
And one more positive: they're very hardy in health terms and tend to live a long time. (mypetneedsthat.com)
Without exposure to bacteria early in life, children's immune systems don't become as hardy as they could be. (health.com)