a high nitrogen (the first of the 3 numbers on the bag) fertilizer. We used a high phosphorus water soluble "starter fertilizer" when hydroseeding your lawn. The good news... is that this is great for new seedlings; however, it isn't as long term as granular fertilizer. The phosphorus will stimulate root growth needed in the early stages of turf establishment..." weed killer UNTIL AFTER your grass begins establishment. Most "Weed &Feed"fertilizers contain a pre and post emergent herbicide. If you have recently used this, review the data...