Posted: 21/01/2014 at 17:41
I've done a few lavendar hedges ...as most others have too.
Those weeds! Nettle and bindweed have brittle roots that will grow from smallest of pieces. Agree glyphosate is the solution. Spray or touch up as soon as weeds are seen in the spring. Repeat at regular intervals during the summer. Resist the temptation to dig these weeds out.
Soil! Very good drainage ....I would add grit rsther than sand. Also add mushroom compost if you can.
Full sun is best.
I would plant when the soil is warmer, when frosts have generally gone, and I would also add a light dusting of organic fertiliser. I would plant 30 to 40 cm apart.