plants are looking great bro nice job.. i got those recipes from "the sierra club of canada"... so they shouldnt have any bad affects on your plants also they are for killing the worms so i wouldnt go to spraying every single tree.. i do have some repellants if your interested that are ment to keep the bugs away ... .. anyways id probably throw in 3 of those lemons in every quart of water for good measure. good luck with your lemons mate...