Houseplant hacks: is a hygrometer a gimmick or a godsend?

Hot radiators and cold draughts can wreak havoc with plants in winter, so do you need a gadget to measure the temperature and humidity of your home?The problem Winter is often seen as downtime for houseplants, so they can get forgotten. Colder days mean the heating is on, the air dries out, and draughts creep in at every window or…