Originally posted by sonhouse
You are proving my point. There would have been no land plants left alive after 40 days and 40 nights buried underwater. If you think that is crazy, try putting a flower plant totally submerged for a week, see if is survives. For one thing,it would receive no sunlight and another, it could not transpire. So how did the entire planet including places like Madagascar, big isolated islands, get their plants back?
Skeptics have a tendency to ignore the fact there are tree and plant species that actually thrive in flood-like conditions or even saltwater. For example, mangroves live primarily along tropical coastlines. Not to mention the flowering plants and trees that flourish in swamplands.
The Bible indicates that as the Flood waters receded, plants had already started regrowing; evidenced by the dove that returned with an olive leaf (Genesis 8:10–11). This happened at approximately Day 278 of the Flood event; 128 days after the Ark came to rest on one of the mountains of Ararat; giving plenty of time for plants to start taking root and regrow. Howe discovered that even after 140 days of soaking, the seeds of wild flowering plant types were still viable enough to germinate.
Another way plants would have survived is that they were taken onto the Ark as food for Noah, his family, and the animals (Genesis 6:21). Some of these plants could have been the cereal plants Howe found were unable to survive a long time immersed in water. Some of these were replanted by Noah and his family after the Flood since we are specifically told he planted a vineyard (Genesis 9:20). After leaving the Ark any seeds the animals ingested during their final days on the Ark could have passed through and then left on the ground in the animals’ excrement.
Many plants and seeds could have survived on vegetation-mats of floating debris. Floating vegetation could have contained many uprooted trees and other plants that could have survived and then regrown once the Floodwaters receded (think, for example, water sprouts). The olive and many other trees and plants are propagated, even today, by asexual budding from planted cuttings. So some seeds could have survived in this debris and their root systems just as Charles Darwin observed, “. . . out of one small portion of the earth thus completely enclosed in by the roots of an oak about 50 years old, three dicotyledonous plants germinated. . . .”
Many herbivorous animals died in the Flood and their carcasses could have floated as carrion on the surface of the waters holding and protecting seeds in their bodies. Once again, Darwin made an astute observation: “Again, I can show that the carcasses of birds, when floating on the sea, sometimes escape being immediately devoured: and many kinds of seeds in the crops of floating birds long retain their vitality. . . but some taken out of the crop of a pigeon, which had floated on artificial sea-water for 30 days, to my surprise nearly all germinated.”
http://www.answersingenesis.org/articles/aid/v7/n1/how-did-plants-survive-flood