Posted: 16/07/2016 at 14:25
They are very close to the wall - even in wet weather walls create a rain shadow
" Walls keep off rain causing a mini-rainshadow up to a metre (yard) wide from the base of the wall. In this zone the soil will be particularly dry and plants may fail to thrive unless watered." https://www.rhs.org.uk/advice/profile?PID=689
They are quite large plants with a lot of foliage - foliage transpires moisture - so give them a couple of large buckets full of water at least two or three times a week until autumn, unless you get a real tropical downpour.
Last edited: 16 July 2016 14:26:59