How to Fertilize giant sowthistle?
Weak general plant feed one application each early spring annually

giant sowthistle · Sonchus fruticosus
Also known as: shrubby sonchus
Best grown in a container of free-draining, loam-based compost, standing outdoors in summer and overwintered in a frost-free position. However, if planted outdoors the roots will often survive even if the top growth is cut down by frost
Weak general plant feed one application each early spring annually