Production of fruits or the absence of fruits in these plants is the result of human intervention through horticulture. To understand this issue, we first need to keep in mind the specific purpose for which a particular plant is grown by humans. Rose plants are mainly grown for ornamental purposes. Rose flowers are considered to be the epitome of beauty. Additionally, most varieties of Rose produce nice fragrance with further adds to its value. Seeds or fruits are not important for Rose plants. Rose is grown by horticulturists worldwide through vegetative propagation. Usually, a portion of the stem is cut off and is put in the soil to produce a new plant. Sometimes, the stem is peeled off at a small section, and clay is applied to produce a new plantlet. Since producing a plant through vegetative propagation requires less time, so it is much beneficial for growing ornamental plants.  Rose is a natural seed-bearing plant but in domestically grown varieties, the petals are so tightly fit that they may not permit pollination and hence fruits do not develop in these plants. Rose plants may not produce viable cell or functional egg. Rose plants may have abortive ovules. They may be self-incompatible There may be internal barriers to pollen tube growth and /or fertilization. Tomato, on the other hand, is produced for its juicy fruits. Hence, cultivators have to follow a method that enables them to get as many fruits as possible. In both cases, the number or size of flowers on a particular plant is not the deciding factor. But the purposes for which a particular plant is grown is the main deciding factor of whether a plant will produce fruit or not.