New look! The new easy-measure bottle minimises contact. Simply loosen the dosing chamber cap, then gentle squeeze the body of the bottle until the required volume is achieved. Pour into your home weedkiller sprayer. Roundup Tough Concentrate is ideal for hard to kill weeds including, Blackberry, Asparagus Fern, Wandering Trad, Lantana, Onion Weed, Paterson's Curse, Bridal Creeper and many others.