I planted Fargesia plants round my garden in the NorthWest region of GREAT Britain. Some have loved it & are 8 feet tall but others look sickly & are more like 1 foot tall. The label just says Fargesia.
1 - How can I help them ?
2 - I really want to divide them, is this possible & if so how ?
3 - Will they spread underground ? as no sign yet
4 - Can I take cuttings ?

Many thanks for your help in advance, Pete