Novice gardeners - we've been given 16 strawberry plants which are thriving (each has 4-5 fruits ranging in size from a pea to a cherry, but still white/green). When do I need to put straw round the plants? Assume it's to keep the fruit raised off the soil and stop them getting too wet/eaten by slugs etc. But if they are strawed now, won't the straw rot after lots of watering to swell the fruit? Advice please.