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Xylella - the Royal Horticultural Society has told show exhibitors that only British-grown hebe, rosemary, lavender, oleander, olives, polygala, coffee, Spanish broom and prunus will be allowed at its shows this year, including this week's Chelsea Flower Show. In recent years there has been an increase in the number of new pests and diseases arriving from abroad andis causing alarm. We speak to the head forester for Prince Charles' Duchy of Cornwall Estate

Medicinal Plants - the National Botanic Garden of Wales opens a new , packed full of plants that have been used to treat various ailments and promote well being

Poultry Units - we discuss聽claims that "an explosion" in in Wales is threatening the environment 聽

Freshwater Pearl Mussels - a in protecting one of the most endangered shellfish in Britain that's facing virtual extinction. We hear the latest developments at the Cynrig Fish Culture Unit near Brecon

Solar Trail - why villages in Snowdonia are representingorbiting around the sun or in this case, Blaenau Ffestiniog!