Great Burnet Tanna A pretty (and fashionable) cultivar of the rare native Irish great burnet, Sanguisorba officinalis Tanna is a compact, clump-forming, herbaceous perennial with blue-green leaves, divided into oblong leaflets. From July to September little bobble-like, deep maroon-red flowers rise above the mound of leaves on slender stems, making intense dots of colour against grasses and other perennials in a sunny border. A low-maintenance perennial, it seeds about, sometimes prolifically. Great Burnet Tanna holds the RHS Award of Garden Merit. Site: Tolerates exposureSoil: Any light, but well-drained soil, preferably moistPosition: Full sun or partial shadeSeason of interest: July to SeptemberHardiness: Fully hardyHeight: 2’6” (75cm) Spread: 18” (45cm)