For a number of homeowners, simple gardening poses a number of issues. They are limited by climate to certain plants, and soil acidity and fertility pose their own problems for those that wish to try their hands at more exotic plants than allowed by the local conditions. Greenhouse plants allow gardeners to eschew those limitations, and to give them time to raise plants as they solve the various limitations placed on them by nature. With enough time, gardeners can easily deal with soil acidity and fertilize the locations where they wish to plant. They just need time to grow the plants so that they are strong enough to deal with local conditions.
Greenhouse plants do tend to be a little weaker than plants grown outside the limits of the greenhouse. The greenhouse creates an artificial environment that allows plants to grow quickly and healthily to maturity. Although they do not need to deal with the environmental conditions of other plants, that is also a minor weakness, as they do not have those conditions to strengthen them either. Although this means that a little more care must be taken with them after they have been transplanted, they do nonetheless quickly rise to the challenge.
Nonetheless, using greenhouse plants does allow a home gardener options that he may not have had previously and allows him to get the equipment for his greenhouse that is needed. The largest advantage that they offer is the ability to grow plants that simply can not grow in the area normally. By creating an area where the temperature and humidity are markedly different from the surrounding area, plants may be grown that require higher temperatures and humidity than would be found in the local area. For example, orchids may be grown in more temperate latitudes. For those wishing more practical plants, this means that fruit and vegetables may be grown in latitudes that would normally not be healthy for those plants.
As for growing plants that can be transplanted to a more native setting, a greenhouse allows the illusion of creating a quick planting. Although mostly recommended for decorative plants, greenhouse plants allow a garden to quickly bloom, as mature plants are moved from the greenhouse to the garden. This can be a great boon for gardeners looking to add some variety to their gardens or for those looking to repopulate same after a crisis. Overall, greenhouse plants are great for those looking for a quick solution to some otherwise difficult problems.