The collections at the Argotti Botanic Gardens & Resource Centre comprise representatives of major plant families that are adapted to a Mediterranean-type bi-seasonal climate, namely a mild wet rainy season alternating with a hot, dry season, each spanning approximately six months.
There are five regions that share these characteristics, namely Central Chile in South America, California in North America, Cape region of South Africa and Southern Western Australia, apart from the lands of the Mediterranean basin itself. The plant collection also includes representatives from the Canary Islands and Madagascar as well as succulents and cacti from other regions of America and Africa. Cacti do exceptionally well in our climate and are well represented at Argotti.
The Argotti Botanic Gardens & Resource Centre host a number of mature botanical specimens planted over the years which include amongst others; Tetraclinis articulata (Sandrac Gum Tree), Ficus macrophylla (Moreton Bay Fig), Argania spinosa (Argan Tree), Pheonix rupicola (Cliff Date Palm), Lagunaria patersoni (Cow Itch Tree), Tipuana tipu (Rosewood, Pride of Bolivia) and Jaracanda mimosaefolia (Jacaranda).
There are also several large specimens of Cereus pringlei and a large collection of succulent Euphorbias. The botanical collections are organised by families and water requirement regimes. There is also part of the garden dedicated to the Mediterranean basin with endemic plants such as Cheirolophus crassifolius (Maltese Rock Centaury), Atriplex lanfrancoi (Maltese Cliff-Orache), Helichrysum melitense (Maltese Everlasting) and Darniella melitensis (Maltese Salt Tree) as well as indigenous orchids.