/give @p wheat_seeds 1 0 {CanPlaceOn:["farmland"]}
creates the seed with the CanPlace on farmland property correctly. Bounding box shows. Cannot be used on the farmland.
I guess this is because it is not a block, but it creates a block on that space. Would be really useful if this command extends to items.
Comments 4
This has been fixed in 14w13c.
I have had wheat_seeds, melon_seeds, pumpkin_seeds, carrot, potato, nether_wart, reeds, cocoa(dye 3) and cactus successfully planting on the right blocks, have been able to get bonemeal to work on all valid crops and used tools to collect all the crops.
My deepest thanks Devs!
Still a bug in 14w08a