my friends have been growing 3 outdoor plants over the past few weeks in vic (weather has been really hot and really cold lately) and i looked outside today and theres a few leaves with some big damage. it only seems to be the bottom leaves so im thinking some sort of deficiency but before i trim the bottom ones off to make sure it doesn't re occur what should i do to prevent this? i havnt been watching these plants for long so i cant say when this all began