It looks like it may finally be time to harvest those tatties. Jim is in the veg plot answering the age-old question, how do you know when they are ready for harvesting? Carole shows us two ways to plant up Alpine troughs. Chris is back with the two new build gardens where he asks both Anna and Susan for three positives and negatives in their garden. Jim also takes a trip down to Logan Botanic Garden which is situated at the south-western tip of Scotland. It is the country's most exotic garden and is famed for its tender collections.