Spacemaster cucumber plants are probably the most compact at a small 18 to 38 inches in height. These little plants are great for planting in pots and leaving on a porch or patio. Don’t let the size fool you though because they still can grow cucumbers a full 7 to 8 inches long. If you want smaller cucumbers, just harvest them when they’re still small. Snatch them off the vine at 4 inches and eat them as they are or pickle them. Even though these plants are relatively small, they are still quite prolific.