Start an entire plant from the cutting of an existing plant young or old. Remove the bottom sets of leaves from the base of each cutting leaving the top 4 to 6 leaves and set it in the water. How To Root Tomato Plants From Cuttings Tomato Plants Growing Tomato Plants Tomato Garden In about 1-2 weeks you will see new. How to start a tomato plant from a cutting . Leave those seeds in the shed. It will grow into a healthy new plant. Choose a large ripe tomato. Make a hole in the center of a 4-inch garden pot and stick one tomato cutting at least 3 inches deep into the soil. To begin fill a pot or container with potting soil almost to the top of the. The trickiest part is finding the suckers on your tomato plants. When you prune tomato plants mean plucking off these suckers that grow between branches save these cuttings. Take the 6 inch cuttings and clip off any flowers or buds. You can use romas beefsteaks or even cherry tomatoes when planting tomato slices.