Hello, I have been experimenting with herb brews, I have not done a heather brew yet but I would guess about 1oz would be a good starting point on your first try using heather, I use about 1 1/2oz total herbs in my herb wheat, .33oz mugwort and .33oz yarrow @ 20min and again @ 5min and some times more yarrow flowers at flame out of I want a more flowery aroma in the brew.
If the heather your using is flowers they are used more for aroma=last 5 min to flame out, if your heather is the hearty part of the plant its more for flavoring=20min to 5 min the longer time will give you more flavor or bittering=60min to 30min in the boil, I have found that herb work a lot like hop additions.
All that being said lol, I would try 1/2oz @ 20min and 1/2oz @ 5min for my first attempt with heather and then adjust those amounts on my next brew.
Hope this helps, good luck, and please post your results.
Bartender Ill have what the gentleman on the floor is drinking.
I have spent more $ on brewing equipment than my truck cost!
Green beer sucks, let it age/condition/finish and become great before drinking it. WileECoyote
Good/Great beer takes time! if you want a quick beer go to the store or bar!
Things come and go. Good beer will live on for ever ! WileECoyote