To protect your newly planted plug plants, you can use plant protection measures and netting. For brassica plug plants, covering them with a fine mesh can help deter cabbage fly and pigeons. Using cabbage collars can also prevent cabbage root fly infestation. Frost protection fleeces are helpful in keeping tender varieties like tomatoes and beans safe. Additionally, using beer traps and scattering slug pellets can deter slugs and snails. Companion plants like nasturtiums can act as a distraction for pests while attracting beneficial pollinators. In cases where rabbits or deer are common, covering the crops with heavy cloches can prevent unwanted nibbling.