Although anyone can claim to inventor or create something (e.g., Al Gore created the Internet), the reality is that an idea needs to be carefully considered in context of the law. If you are serious about protecting your invention, you should contact a patent attorney or patent agent. Applying for a patent, and its subsequent patent prosecution process, does cost money. You may see ads for low-cost services to file a patent on your behalf. Such solutions are viable if your goal is to boast to your friends that you patented something. However, if you have real-world business ambitions, it is imperative that the person writing the claims of your patent is a well-qualified lawyer. The adage "you get what you pay for" is very true in the intellectual property community. Realistically, a single patent is going to minimally cost you around $10K for the application fees, legal fees to write the claims, and so on. You want to find a legal professional that is a subject matter expert in your domain (whether it is IT, manufacturing, mechanical engineering, biotech).
A plant patent covers asexually reproducible plants (that is, through the use of grafts and cuttings), such as flowers. Sexually reproducible plants (that is, those that use pollination), can be monopolized under the Plant Protection Act. Both sexually and asexually reproducible plants can now also be monopolized by utility patent. Plant patents are comparatively recent innovations, the first one being granted in 1930. A plant patent is granted by the Government to an inventor (or the inventor's heirs or assigns) who has invented or discovered and asexually reproduced a distinct and new variety of plant, other than a tuber propagated plant or a plant found in an uncultivated state. The grant, which lasts for 20 years from the date of filing the application, protects the inventor's right to exclude others from asexually reproducing, selling, or using the plant so reproduced. This protection is limited to a plant in its ordinary meaning: (1) A living plant organism which expresses a set of characteristics determined by its single, genetic makeup or genotype, which can be duplicated through asexual reproduction, but which can not otherwise be "made" or "manufactured." (2) Sports, mutants, hybrids, and transformed plants are comprehended; sports or mutants may be spontaneous or induced. Hybrids may be natural, from a planned breeding program, or somatic in source. While natural plant mutants might have naturally occurred, they must have been discovered in a cultivated area. (3) Algae and macro fungi are regarded as plants, but bacteria are not. A utility patent would be filed for claims to plants, seeds, genes, etc. According to the USPTO, there were 959 plant patent applications filed in 2009.
The Japanese commissioner in Washington DC in the 1900's studying the American patent system said, "We have looked about us to see what nations are the greatest, so that we can be like them... We said, 'What makes the United States such a great nation?' and we investigated and found that it was patents, and we will have patents."
Patents have a maximum life of 20 years and, therefore, a 20-year potential monopoly. Patents that are just beginning their life and which have longer to run on the their potential monopoly position understandably will have more value. It is rare that a patent nearing the end of its term will cause a great threat to its competitors. It is almost certain that they will have devised technologies or products of their own by then that will not interfere with the patent owners monopoly position. In addition, one has to take into consideration the potential business life of a patent, i.e., the duration, which a patent is likely to be economically useful, if other subsequent patents are providing better alternatives to it.