A rotor blade assembly for a wind turbine, the rotor blade assembly comprising: a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge each extending between a tip and a root, the rotor blade further defining a span and a chord, and a plurality of vortex generators configured on at least one of the suction side or the pressure side and disposed within an inboard area of the rotor blade, the plurality of vortex generators comprising a row of vortex generators extending in a generally span-wise direction, the row comprising a first portion of vortex generators and a second portion of vortex generators, the second portion of vortex generators spaced apart from the first portion of vortex generators in the span-wise direction, each first portion of vortex generators being disposed at a first chord-wise location, and each second portion of vortex generators being disposed at a second chord-wise location spaced apart from the first chord-wise location, whereby the second portion is offset from the first portion in both the span-wise and chord-wise directions; wherein at least a portion of the first portion of vortex generators is further disposed between the root and a span-wise maximum chord location characterised in that the first chord-wise location is between 10% of a local chord and 20% of a local chord, and wherein the second chord-wise location is between 25% of a local chord and 35% of a local chord; said local chord being a straight line between the leading edge and the trailing edge and the percentage being defined from the leading edge; and each of the first portion vortex generators has a height and a length that are greater than a height and a length of each of the second portion vortex generators. a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge each extending between a tip and a root, the rotor blade further defining a span and a chord, and a plurality of vortex generators configured on at least one of the suction side or the pressure side and disposed within an inboard area of the rotor blade, the plurality of vortex generators comprising a row of vortex generators extending in a generally span-wise direction, the row comprising a first portion of vortex generators and a second portion of vortex generators, the second portion of vortex generators spaced apart from the first portion of vortex generators in the span-wise direction, each first portion of vortex generators being disposed at a first chord-wise location, and each second portion of vortex generators being disposed at a second chord-wise location spaced apart from the first chord-wise location, whereby the second portion is offset from the first portion in both the span-wise and chord-wise directions; wherein at least a portion of the first portion of vortex generators is further disposed between the root and a span-wise maximum chord location characterised in that the first chord-wise location is between 10% of a local chord and 20% of a local chord, and wherein the second chord-wise location is between 25% of a local chord and 35% of a local chord; said local chord being a straight line between the leading edge and the trailing edge and the percentage being defined from the leading edge; and each of the first portion vortex generators has a height and a length that are greater than a height and a length of each of the second portion vortex generators.