Eucalyptus is a fast grower, and great for family cold symptoms. Course rough bark and large leathery bluish-green leaves. Can be grown indoors in a large pot, and put outside for the summers. If planting outside give at least 6' spacing and be aware that the toxic roots inhibit the growth of nearby plants.
Preference is for dry soil conditions.
If growing in a pot let the soil dry out between waterings. I have found the trees to be easy winter keepers, requiring little attention. The leaves aroma of scented camphor is used to treat colds and flu. The flower nectar gives honey. Eucalyptus oil is antiseptic, expectorant, and anti-viral.