Does anyone know if you can buy iron liquid feed for plants with yellowing leaves and if so what would it be called in Spanish. Many Thanks.

"Liquid food with iron for plants with yellow leaves" translates as "Alimentos líquidos con hierro para las plantas con hojas amarillas" in Google Translate (useful tool).
If you go into Sol D'Ebre to the counter at the back of the big shed at the rear and present a piece of paper with the above written on, you should find that one of their resident experts will be able to help you.  It may help to know what type of plants are affected by the yellowing.

Thanks very much for the info, will try Sol D'Ebre next week and hope this resolves the problems with my Hydrangeas and Virgina creeper as they are both in containers.

Why do you think you need Iron ?

Plants main food is N,P,K.. so all fertilisers are graded by this ratio, eg. 8:2:2 [high N for growth] or  1:3:10 [for flower/fruiting]

Most people kill pot plants by overwatering, rotting the roots, overfeeding is also very common and easy to do.

Nitrogen deficiency, if you have it, is usually shown as a yellowing, from the bottom of the plant.

Hi,
I have come across this problem before in Uk many years ago and knew what to use. As for overwatering and feeding, not guilty but him indoors is guilty every Saturday night but unfortunately he is still with me. I must admit I do wonder if he has root rot. The yellowing is the entire plant. Thanks for your input.