Yeah seed is a different material. Especially for vermin-edibleness and oil-pressing.
[PRODUCT:100:1:SEEDS:NONE:GET_MATERIAL_FROM_REAGENT:A:NONE]
would use the plant_growth mat that was the reagent.
[PRODUCT:100:1:SEEDS:NONE:LOCAL_PLANT_MAT:SEED]
I don't think a reaction has a "local plant" context.
I'd go with [PRODUCT:100:1:SEEDS:NONE:PLANT_MAT:hf_BOXWOOD:hf_BOXWOOD_SEED]
Sacrifice stuff, get seeds:
[PRODUCT:100:4:SEEDS:NO_SUBTYPE:PLANT_MAT:barley:SEED]
[REACTION:SACRIFICE_NATURE3]
[NAME:sac rat remains, seeds]
[BUILDING:ALTAR_NATURE:NONE]
[REAGENT:A:3:REMAINS:NONE:NONE:NONE] --takes in vermin remains
--REAGENT:B:1:WOOD:NONE:NONE:NONE]
[PRODUCT:24:1:SEEDS:NO_SUBTYPE:PLANT_MAT:mandrake root:SEED]
[PRODUCT:9:4:SEEDS:NO_SUBTYPE:PLANT_MAT:barley:SEED]
[PRODUCT:9:4:SEEDS:NO_SUBTYPE:PLANT_MAT:rye:SEED]
[PRODUCT:11:4:SEEDS:NO_SUBTYPE:PLANT_MAT:starapple:SEED]
[PRODUCT:11:4:SEEDS:NO_SUBTYPE:PLANT_MAT:mossberry:SEED]
[SKILL:ALCHEMY]
[REACTION:SACRIFICE_NATURE4]
[NAME:sacrifice ashes, wood]
[BUILDING:ALTAR_NATURE:NONE]
[REAGENT:A:150:BAR:NONE:ASH:NONE]
[PRODUCT:15:1:WOOD:NONE:PLANT_MAT:FUNGIWOOD]
[PRODUCT:8:4:WOOD:NONE:PLANT_MAT:TUNNEL_TUBE]
[SKILL:ALCHEMY]
[REACTION:SACRIFICE_NATURE1]
[NAME:sac horns+teeth, seeds]
[BUILDING:ALTAR_NATURE:NONE]
[REAGENT:A:1:ANY_RAW_MATERIAL:NONE:NONE:NONE][ANY_HORN_MATERIAL]
[REAGENT:B:3:ANY_RAW_MATERIAL:NONE:NONE:NONE][ANY_TOOTH_MATERIAL]
[PRODUCT:18:1:SEEDS:NO_SUBTYPE:PLANT_MAT:mandrake root:SEED]
[PRODUCT:6:4:SEEDS:NO_SUBTYPE:PLANT_MAT:barley:SEED]
[PRODUCT:6:4:SEEDS:NO_SUBTYPE:PLANT_MAT:rye:SEED]
[PRODUCT:5:4:SEEDS:NO_SUBTYPE:PLANT_MAT:starapple:SEED]
[PRODUCT:5:4:SEEDS:NO_SUBTYPE:PLANT_MAT:mossberry:SEED]
[PRODUCT:10:1:WEAPON:ITEM_WEAPON_DAGGER:GET_MATERIAL_FROM_REAGENT:A:NONE] --maybe get a dagger made of horn.
[SKILL:ALCHEMY]