 It is fairly easy to grow in areas with a Mediterranean climate , but does not do well in areas with high summer humidity . It requires a sunny position in well @-@ drained soil , and tolerates at least moderate frost . It should be pruned lightly , not below the green foliage , as it tends to become straggly with age otherwise . Seeds do not require any treatment prior to sowing , and take 21 to 35 days to germinate . 
