Mrs J and I have just been to the new garden center at Puerto, and we found it to be excellent! A huge range of flowers, plants and trees along with herbs and seeds. There is a good selection of pots and planters etc. along with insecticides and fertilisers. Prices very reasonable, highly recommended. For those that don't know it's on the FV10 out of Puerto heading to Tetir, the entrance is slightly tricky to find, you turn right immediately before the filling station heading down the hill into Puerto then take the new road behind the filling station to get to the garden center. Well worth a visit.
Another way in is to take the slip road off the roundabout heading South onto the ring road. Immediately on your right is a dirt track heading into the centre.