Final answer:
The major disadvantage of having live plants in a reception area is a decline in the population of organisms like butterflies and amphibians due to lack of flowering and water availability.
Step-by-step explanation:
The major disadvantage of having live plants in a reception area is that their numbers will decline as their plant hosts of butterflies may not flower earlier and young amphibians may not be viable as there might be a lack of water.
Live plants provide a suitable environment and resources for various organisms such as butterflies and amphibians.
However, if the plants in the reception area do not flower early or if there is a lack of water, it can negatively impact these organisms, resulting in a decline in their population.