Plant into well-conditioned, well-drained soil. Position the plants somewhere they’ll have cool roots but sun further up, though many are shade tolerant.
Plant large-flowered summer-blooming clematis so their stem bases are buried 2-3in (5-8cm) below soil level. Plant the rest normally.
Prune spindly newly planted clematis to 12in (30cm) above soil level to encourage multiple stems.
Water during droughts while establishing.