One of the last Harvestcraft-versions renamed all items to lowercase. For example "harvestcraft:artichokeItem" became "harvestcraft:artichokeitem". Because of that, the config-files a19 generates won't work with the latest Harvestcraft-version. You can't analyze or plant any of the HC-seeds.

You'll get tons of errors like:

00:00:00] [Client thread/INFO]: Invalid Product: Invalid Item: harvestcraft:riceItem!

and of course all mutations fail:

[00:00:00] [Client thread/INFO]: Invalid Mutation: Invalid Child: "celery_plant"!

Duplicate of #988.

Already reported as #988 .
PR also available: AgriCraft/AgriPlants#26