Training tomato plants helps produce earlier tomato yields. Many gardeners use the Wall O' Water to establish plants earlier, however if the temperatures are too cool at flowering fruit will not form. In pumpkin growing, biggest is the only way many gardeners grow. Varieties such as 'Atlantic Giant' , 'Big Max' , and 'Prizewinner' all fit in the largest pumpkin category. All require a 120 day growing season.
Some extra hints are appropriate when growing the biggest pumpkin.
Allow only one or two fruits to develop on the entire plant. Remove all others. Water regularly if mother nature doesn't provide enough. They will need at least 100 days to mature and plenty of warm weather. Seed catalogs claim they'll weigh over 200 lbs.