An assembly for treating plant matter, comprising a spraying apparatus (100, 400), the spraying apparatus comprising: a mounting portion for mounting a cartridge within the spraying apparatus; and a multi-layered manifold assembly (500, 600, 700, 800) comprising abutting layers, wherein the manifold assembly is received or mounted within the mounting portion such that as the cartridge is received within the mounting portion, the cartridge engages and couples with the manifold assembly (500, 600, 700, 800) to allow fluid to be extracted from the cartridge into the spraying apparatus (100, 400), the manifold assembly comprising: a first layer (602, 702, 802) and a second layer (604, 704, 804); a fluid port (606, 706, 806) located in the second layer (604, 704, 804), for receiving liquid concentrate from a reservoir of liquid concentrate within the cartridge; a fluid inlet (608, 708, 808), located in the first layer (602, 702, 802), for receiving water from the spraying apparatus (100, 400); and a fluid outlet (610, 710, 810), located in the first layer (602, 702, 802), for outputting a mixture of water and liquid concentrate to the spraying apparatus; wherein the manifold assembly (500, 600, 700, 800) comprises a flow path between the fluid inlet (608, 708, 808) and the fluid outlet (610, 710, 810), and wherein the flow path between the fluid inlet (608, 708, 808) and the fluid outlet (610, 710, 810) includes a mixing section fluidly connected to the fluid port (606, 706, 806) and configured to mix liquid concentrate received from the fluid port (606, 706, 806) with water received at the fluid inlet (608, 708, 808). a mounting portion for mounting a cartridge within the spraying apparatus; and a multi-layered manifold assembly (500, 600, 700, 800) comprising abutting layers, wherein the manifold assembly is received or mounted within the mounting portion such that as the cartridge is received within the mounting portion, the cartridge engages and couples with the manifold assembly (500, 600, 700, 800) to allow fluid to be extracted from the cartridge into the spraying apparatus (100, 400), the manifold assembly comprising: a first layer (602, 702, 802) and a second layer (604, 704, 804); a fluid port (606, 706, 806) located in the second layer (604, 704, 804), for receiving liquid concentrate from a reservoir of liquid concentrate within the cartridge; a fluid inlet (608, 708, 808), located in the first layer (602, 702, 802), for receiving water from the spraying apparatus (100, 400); and a fluid outlet (610, 710, 810), located in the first layer (602, 702, 802), for outputting a mixture of water and liquid concentrate to the spraying apparatus; a first layer (602, 702, 802) and a second layer (604, 704, 804); a fluid port (606, 706, 806) located in the second layer (604, 704, 804), for receiving liquid concentrate from a reservoir of liquid concentrate within the cartridge; a fluid inlet (608, 708, 808), located in the first layer (602, 702, 802), for receiving water from the spraying apparatus (100, 400); and a fluid outlet (610, 710, 810), located in the first layer (602, 702, 802), for outputting a mixture of water and liquid concentrate to the spraying apparatus; wherein the manifold assembly (500, 600, 700, 800) comprises a flow path between the fluid inlet (608, 708, 808) and the fluid outlet (610, 710, 810), and wherein the flow path between the fluid inlet (608, 708, 808) and the fluid outlet (610, 710, 810) includes a mixing section fluidly connected to the fluid port (606, 706, 806) and configured to mix liquid concentrate received from the fluid port (606, 706, 806) with water received at the fluid inlet (608, 708, 808).