Although the process to growing long stemmed roses is very time consuming and tedious, it is not impossible, and the end result is a flower whose romantic beauty is unsurpassed. However, it is recommended that they be grown in greenhouses since they require a tremendous amount of climate control to achieve the desired results of a long stemmed rose. Although many varieties of roses are more suited to this task, long stemmed roses are not a specific variety. They are produced by pruning and climate control.
When pruning, you allow the central, stronger bud to remain while trimming off the rest. As with any plant, if you remove all other buds, the one remaining will grow larger and stronger. Whether in a greenhouse or at home, you want to create the optimal temperature of 80 degrees and with a humidy of 60-70%. If the temperature differs from this in anyway, the strength and length of the stem will decrease. By controlling the climate in this way, you are trying to create a stress-free environment. If any conditions are not at optimal level, the plant must work harder to make up for it, thus depleting its energy and the output it produces. Carbon dioxide supplementation is almost necessary when creating long stemmed roses. Without it, the stems do not grow as long or as strong and the leaves are not as full. This particular process is difficult to do without a greenhouse. Unfortunately this means that, without the proper environment, it is very difficult to produce florist quality roses. Don't let this discourage you because you can still enlarge roses substantially in your own garden by practicing the same pruning methods and fertilizing heavily.