B&Q are supplied by a company called Verve, its now on all their labels.
They do three tiers of plants, small job lots such as buy two 1Lt pots for £5, a middle 2Lt pot for £8-10 or the semi mature versions that cost £25-30 or upwards.
Over the last few years I've found actual garden centres to be the priciest places to shop, stocking worthy plants but with that plastic commercial smile I don't like. I would always support a local nursery purely because its a small business, likely to be family run and I've always found them to be honest and helpful. A few years back we bought some mature plants knocked down and even got free delivery!.
At the moment both the above are out of my walking distance to get to, so B&Q is my only supplier and whilst the advice is mind blowingly bad and the plants are mass produced with a bit of a gamble as to cultivars, I still find them okay. The plants are always healthy with a good variety to cater to most tastes. I think the prices are pretty reasonable especially if you go at the end of seasons when they are reducing plants that are going over. I love sniffing around the half price trolley!
My only complaint would be the labelling and not just missing labels like today, but the information they give you is poor. Last year's purchase of Callistemon leavis is currently sitting in a pot cut back hard after it turned brown post snow. I dug it up with the intention of dumping it on the customer services desk because the label did not mention it being tender at all, only the base was not dead, only its top growth. so I cut it back hard (apparently they recover from this as its like a bushfire) and stuck it in a pot to look after it better, but if the label had warned me, I wouldn't have bought it in the first place.
