Mulch is for keeping moisture in, I use grass clippings, leaves, or spent compost. If you plant through black plastic sheeting punched out to take the seeds or plants, it saves a lot of effort keeping the weeds out. The black plastic also warms the soil during spring planting. Everybody uses it here, it works great. Comes in big rolls and cheap enough. Bare rows for walking and tending the plants is all you need without the covering.. For squash and things that really spread out, people put out carpets of hay so the fruits don't sit on the ground. Helps keep the weeds down as well and moisture in. Zillions of gardens around to see how people are doing it.
Plants get sluggish I give them a shot of tea that I make from soaking compost and fish emulsion with some micronutrients added (a little molasses and epsom salts). It really gives them a jolt and very noticeable spurts of growth, They really shoot up and it seems to much encourage putting out what you can eat. Some plants are heavy feeders, love to feast now and then.