farming.register_hoe(name, hoe definition)
 -> Register a new hoe, see [hoe definition]
 
farming.register_plant(name, Plant definition)
 -> Register a new growing plant, see [Plant definition]

Hoe Definition
{
	description = "",	-- Description for tooltip
	inventory_image = "unknown_item.png",	-- Image to be used as wield- and inventory image
	max_uses = 30,	-- Uses until destroyed
	material = "",	-- Material for recipes
	recipe = {	-- Craft recipe, if material isn't used
		{"air", "air", "air"},
		{"", "group:stick"},
		{"", "group:stick"},
	}
}

Plant definition
{
	description = "",	-- Description of seed item
	inventory_image = "unknown_item.png",	-- Image to be used as seed's wield- and inventory image
	steps = 8,	-- How many steps the plant has to grow, until it can be harvested
	^ Always provide a plant texture for each step, format: modname_plantname_i.png (i = stepnumber)
	minlight = 13, -- Minimum light to grow
	maxlight = default.LIGHT_MAX -- Maximum light to grow
}