Despite its small area of just under one hectare, the Botanical Garden displays about 300 different species of woody plants, including some large trees. Some of these trees were planted when the garden at Spalentor was newly established in 1898.

These include:

• Giant sequoia (Sequoiadendron giganteum)
• Tulip tree (Liriodendron tulipifera)
• Hanging beech (Fagus sylvatica var. pendula)
• Cord tree (Sophora japonica)
• bald cypress (Taxodium distichum)
• Ginkgo (Ginkgo biloba, female)
• Judas tree (Cercis siliquastrum)
• Indian banana (Asimina triloba)