By Gardeners' World on 22/07/2011 15:52:43
by a sea of blue campanula flowers. March - JulyJune - August20 minutesMyrtle, Myrtus communis subsp. tarentinaCampanula portenschlagiana x2Small window boxCrocksLoam-based compost, such as John Innes No. 3Cover the bottom of the window box with crocks