Salvia pratensis 'Madeline'
(Meadow sage). Seedlings from this hardy perennial which forms clumps of mid green leaves and masses of upright spikes of small but beautiful deep blue flowers with a contrasting white lower lip, which is very finely edged with purple. Will repeat flower all summer long if spent flower stems are removed regularly. Full sun. 70cm x 40cm. 1 litre pot.