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Too low humidity throughout the start of the plants life can be extremely detrimental and it can cause dehydration and growth problems, so its best to make sure you can keep it up around the 70% area. However, when in full flower you ideally need the humidity below 50% as this will reduce the risk of botrytis and/or mould developing . Our hygrometers with external probe are an essential to monitor your humidity levels so you can adjust accordingly. We have a full range of humidifiers to bring your humidity up and a full range of dehumidifiers to bring it back down.