If you are a gardener who has been on any social media platform in the past five years, you will have seen them: dozens of posts extolling the virtues of using milk as a magical ingredient to transform the health of your houseplants. Now, you don’t have to be a botanist like me to think this might not be the best idea. But science is all about trying to stay as objective as possible, so I decided to comb through the evidence to challenge my preconceptions.
Given how many times I have seen this idea circulate online, I have yet…
