You are right it is - but 5kgs was all I managed to pick this year and I think it will make a fuller wine if I use it for one gallon instead of 2 or more....
I also have on the go at the moment - 2 gallons of mead, 3 gallons of hawthorn berry, 2 gallons of birch sap, 1 gallon of gorse, 3 gallons...