Must grass be fertilized? Which fertilizer is best used? I have purchased a fertilizer for my flower plant, can it be used for my lawn grass too?

Yes, fertilizer is needed to ensure your grass grows healthy. Suitable fertilizer would be the organic 8:8:3 turf grow, which is best used once in every month. It is a granular fertilizer and can be applied using a spreader as much as about a handful to 4m² and watered into the grass. If the fertilizer is meant for flowers, then it is not suitable for your lawn grass.