I have a choclate brown lab, i cant seem to get her to stay off the flower beds ive put up a 2foot fence but she has learnt to jump over shes 4 months old and loves eating my plants....
no quick fix but you could try staying out in the garden with her and playing and talking to her. The minute she goes into the area you want to keep her out of turn you back and do not look around or talk or reward her in anyway until she comes back to where you want her to be then immediately reward her with food/cuddles/a game or cheery voice.