How low do you want to go? Chempak makes a full range of fertilisers. The basic "low nitrogen" product is Chempak #8, which is 12.5-25-25. Then there are several "specialist" formulations which have even lower nitrogen. A good garden centre will have a selection of Chempak numbers, or you can buy online.
Then I have to ask why it is that you want to fertilise a maple? Is it potted? Is it chlorotic? For a zero nitrogen fertiliser, you might be best just working out what nutrients you want and using the raw ingredients, such as straight potash. Also with a chlorotic plant, increasing soil acidity is a far better solution than fertiliser.
Thanks for the advice. Actually I have several containerised maples and I have been in the habit of giving a small amount of osmocote fertiliser earlier in the year. I had a problem with the medium in which these maples were planted and sought some advice from maple enthusiasts on the Maple forum in the US. I was recommended to replace the growing medium with a more freedraining type and to employ a fertilisation regime. The process recommended was that I fertilise with a 1/4 strength soluble fert during the Spring and middle part of the year and to give nitrogen free fertiliser at the tail end of the growing season.Being as I had already added a small amount of osmocote earlier I have done nothing regarding feeding for the moment but thought that I should try to find some nitrogen free fert for later on. Is this sound advice ?
