Bamboo Advice

I planted 3 bamboo, Fargesia Red Dragon 4 weeks ago they are 1 metre tall. They are in a beautiful old cattle water trough in John Innes no. 3, in dappled shade with a fence panel and wall behind them. The compost is moist on poking a finger down into it. My concern is the brown leaves, which are appearing further down the stems from fresh new green leaves. The trough and plants were a Mother's Day gift from my lovely Hubby, he set up micro irrigation from the mains tap, am I being paranoid or could it be simply the bamboos don't like our tap water? Any advice is very welcome I really want them to flourish and cover over said fence panel. Thanks everyone for reading my waffle!
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Lily6, drainage holes are a must.
That's strange Dee, I may well be wrong of course. I've never fed mine in 10 years (although to be honest, I must confess they have died on me this year!!!).
Lily6. It occurs to me that the brown leaves on the lower part may be just old ones that are being shed to make way for the new? I would perhaps shut off the water for a couple of days at least and watch what happens. Fargesia is largely evergreen and evergreens do drop their old leaves around now.
Watering and Feeding