tarragon - does it go in the boil? how much to use?

[jturkish]

i'm making 2.5 gallons wheat lager

61.5% red wheat

15.4% vienna malt

15.4% german pils

7.7% cara munich

.4 oz spalt hops 20 min

1.5 grams cardamom towards flameout

w34 dry lager yeast