This towering beauty produces its clear blue flowers over a couple of months from midsummer - so it's perfect for adding soft, unstructured height  and colour to the back of the border. As its common name suggests, it is happiest in soils that are reliably moist but not waterlogged, and it prefers a sunny spot. The flowers mix well with most pinks, purples and plums, and they are also sought after by bees and butterflies.
                                    
                                        How to care for Salvia uliginosa:
                                         To prolong flowering remove the flower spikes as soon as they start to fade. Apply a generous 5-7cm (2-3in) mulch of well-rotted garden compost or manure around the base of the plant in spring.
                                     
                                        
                                        
                                            Flowering period:
                                            
                                                
                                                    - Jan
 - Feb
 - Mar
 - Apr
 - May
 - Jun
 - Jul
 - Aug
 - Sep
 - Oct
 - Nov
 - Dec
 
                                                
                                             
                                         
                                        
                                        
                                            Eventual height:
                                            1.5m
                                            Eventual spread:
                                            1m
                                         
                                        
                                        
                                            Rate of growth:
                                            Fast-growing
                                         
                                        
                                            Soil:
                                            Moderately fertile, moist, well-drained soil
                                         
                                        
                                            Hardiness:
                                            Borderline hardy (will need protection in winter in colder areas)
                                         
                                    
                                        
                                            - 
                                                
This perennial dies back to below ground level each year in autumn, then fresh new growth appears again in spring.