Excess moisture can cause a variety of problems and diseases in trees, ranging from root rot to fungal diseases. Moisture encourages the growth of fungi and bacteria, which can damage the roots and bark of trees. It can also cause decay in woody plants, leading to weakened branches or even death of the tree.
There are two causes for root rot, but the main cause is poorly drained or overwatered soils. These soggy conditions prevent roots from absorbing all the oxygen they require to live. As the oxygen-starved roots die and decay, their rot can spread to healthier roots, even if the soggy conditions have been rectified.
An overabundance of moisture leads to widespread spotting, streaking, and disease-related browning of leaves, mostly caused by fungal diseases that thrive in warm, humid or wet conditions. The good news is that plants usually “grow through” most leaf diseases, although they may look bad and/or drop leaves prematurely.
Roots growing in waterlogged soil may die because they cannot absorb the oxygen needed to function normally. The longer the air is cut off, the greater the root damage.
Help for Rain Damaged Plants
If your plant stems are broken, rather than bent, you can help them recover by removing severely damaged tissues within a week after the damaging rain. This makes room for new leaves and shoots, and helps prevent the damaged, browning tissues from encouraging disease.
Overwatered plants can sometimes recover on their own, but it depends on the plant and the extent of the overwatering. If the roots have rotted, the plant will likely not recover. However, if the overwatering has only caused the leaves to wilt, the plant may be able to bounce back.
Roots need oxygen which is present in the soil. When the soil is saturated or flooded, the water displaces the oxygen which simply causes the fine root hairs to die from lack of oxygen.
Once too much water is absorbed by the roots, root rot can occur. The roots start to rot, become brittle and break down. Eventually, the plant no longer has functioning and healthy roots, and it can no longer absorb water and nutritions nor oxygen.
What Does Soggy Soil Look Like? Soggy soil will look dark and damp, and will hold its form when squeezed and compacted and will have a plastic consistency. If you squeeze darker soil in your hand, and it maintains that shape, your water is soggy.
When a plant is first becoming overwatered, leaves turn yellow. If soil doesn't have a chance to dry out before you water again, leaves start to wilt. When overwatering is the problem, wilted leaves are soft and limp. (If too little water is the issue, wilted leaves are dry and crispy.)
That's why we don't recommend leaving your indoor plants outside overnight, except maybe on a warm Summer night. Light is Best - Heavy rain can damage your precious indoor plant. So, light rain is best for your plant to get all the benefits, without the risk.
Potential consequences of heavy rainfall
Heavy rainfall can lead to numerous hazards, for example: flooding, including risk to human life, damage to buildings and infrastructure, and loss of crops and livestock.
With that being said, it can sometimes be a good idea to water your garden after a period of rain. The ground will already be soft. This will allow the water to penetrate deeper into the soil , so the plant's roots will find it easier to take up.
Once established, root rot is difficult to treat. The best you can do is to take the plant out of its pot, remove the parts of the plant that are affected (including the roots) and repot into fresh compost.
Is it possible to reverse root rot? No, once the roots have started decaying, those root portions are on their way out. You can, however, help prevent the rot or fungal decay from spreading further.
Cinnamon is highly caustic, and rotting orchid roots are terribly vulnerable and delicate. While cinnamon does technically have antifungal and antibacterial properties, it is not a recommended treatment for root rot.
There is no truly quick fix to wet, soggy soil. To help speed the process, break up and turn the soil to expose more of the water to the air. Mix in some dry compost or other organic material.
Lime is highly effective at increasing soil pH in acidic soils. Even small applications can increase pH by 0.5 to 1 unit. The degree of change depends on the soil's buffering capacity. Soils with low cation exchange capacity (CEC) will see greater pH increases from liming.
Overwatering can lead to root rot, which is a condition where the roots become waterlogged and unable to absorb oxygen. Excessive rains can cause flooding and soil erosion, which can damage the tree's root system.
The most common uses of hydrogen peroxide for plants include: Eliminates root rot. Supports growth of healthier roots.
Rescue Techniques for Wilting Plants
Wilted, overwatered plants are not always a lost cause. Move your plant to a shady area even if it is a full-sun plant. Remove any dead or dying leaves. These should be easily recognizable.
Too much rain, combined with our warm summer temperatures, creates an ideal environment for bacterial and fungal problems. Monitor your plants for signs of disease — spots or other discoloration on foliage, as well as rotting or wilting of stems, fruit, or even the whole plant.