We can probably say that it’s safe now to trade snow shovels for garden shovels, snowplows for lawn mowers and mittens for garden gloves. With temperatures climbing into the 60s on a regular basis it’s a downright heat wave — plenty warm to start sprucing up lawns and garden beds. Now is the time to consider everything from mulching grass and checking for disease to inspecting your lawn mower and choosing a date to fertilize. Here, lawn and garden experts offer nine tips for treating your patch of green well and getting it in tip-top shape: Maintain your mower Inspect your lawn mower, said …