Dig the planting hole twice as wide and to the same depth as the root-ball. Remove the plant from the container, gently tease the roots and cut away any circled or tangled roots.
Position in hole and backfill with soil, gently firming down. Form a raised or doughnut shaped ring of soil around the outer edge of the plant's root zone. This helps keep water where it's needed. Always water in well after planting to settle the soil around the roots and keep the soil moist for several weeks while the new plant establishes.
Mulch around the base with organic mulch like bark chips, sugarcane or pea straw, keeping it away from the trunk.
Water deeply, once or twice a week, depending on weather conditions.
Once an agave has flowered, the plant will slowly die but not before it has produced numerous offsets or suckers at the base that can be detached to start afresh.
A. americana was named ‘century plant’ because it was thought to live that long before producing a flower. However, the real time is more like twenty to thirty years. This species is plain green but there are some attractive forms striped cream or yellow. Creamy-yellow flower spokes may reach 4-6m in height.
An outstanding feature plant is the slow-growing Agave victoriae-reginae. Its dark-green leaves are attractively patterned in white, but the tips are very sharp.
Some agaves are frost-tolerant while others need warm conditions.
Some species have sharp spines on the leaf margins which can be dangerous.
Sap of some Agave species can be irritating to skin.
Leaves can be damaged by hail.
Suckers can be separated from the base anytime, and treated like large cuttings.
This information is from the Yates Garden Guide: fully revised & updated 44th edition, HarperCollins, $39.99. You can have this information and so much more at your fingertips by purchasing the Yates Garden Guide, available at all leading bookstores and Bunnings stores.