In early spring, [or late winter in southern locations] mow your buffalograss to a height of 1 inch. This will remove the old grass debris and allow the sun to warm the soil faster so your buffalograss will green up earlier. Since you are helping the ground warm earlier than normal, you will need to apply a pre-emergent or a fertilizer with crabgrass and/or annual grassy weed control at this time. Any product available at your garden center should be OK to use. Read and follow the label. Repeat this application at a ½ rate in 6-8 weeks for season long control.