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thermal mass and overwintering

Campanula UK Z8
20 years ago

hello.new to this site. what is thermal mass ( i have read stuff about milk jugs) and could i use it to help to overwinter a large phoenix date palm i have been bullied into planting for a friend. i have built a timber frame around the palm - it is about 3.5m high - and have wrapped fronds with horticultural fleece. the frame would be covered with clear PVC and, i was going to stuff it with straw. i was thinking of using some form of heat but, as you can imagine, there is little space between outer clear covering and inside wrapped leaves so perhaps some useof thermal mass will help. i realise this forum deals mainly with edibles but i grow those too on my allotment so all advice is useful. many thanks everyone and good gardening.

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