Stunted slow growth with yellowing leaves is a symptom of over watering. Plants may suffer from leaf scorch or leaf burn. Water soaked spots and blisters (Oedema) may appear on stems and leaves. The crown of the plant may rot.
The good news is that most plants will bounce back between 7-14 days if they're given proper care (which includes rehydration). If this isn't possible because major damage was done or little healthy root system exists then expect about 2 weeks until improvement can be seen.
1. If a plant is overwatered, it will likely develop yellow or brown limp, droopy leaves as opposed to dry, crispy leaves (which are a sign of too little water). Wilting leaves combined with wet soil usually mean that root rot has set in and the roots can no longer absorb water.
To dry out soil quickly, you can apply hydrated lime to the soil, add compost and then turn the soil thoroughly to aerate it.
It may take an hour or more to thoroughly re-wet the soil. Be careful not to leave pots soaking in standing water continuously. Check them after an hour or two and remove them when they are hydrated.
Signs of root rot are slow growth, mushy stems, and wilting, yellow, distorted leaves (especially when the plant has been well watered, as wilting leaves can also be a sign of a dry plant).
Look out for signs of overwatering – including a limp plant, yellowing leaves, or dropping leaves. If you see these signs, test the soil with your fingers. It should be pretty obvious if it's soggy! Stop watering and let the soil dry out.
One of the quickest, first signs of overwatering your plants is to observe occurs at the tip of the leaf. If the tip of the leaf is turning brown this is a sign of overwatering. Too little water will result in your plant's leaves feeling dry and crispy to the touch while too much water results in soft and limp leaves.
If overwatering is the issue, the roots will look dark and feel mushy to the touch. The plant's soil may also give off a sour, funky smell, due to water-loving bacteria forming around those roots.
In the most extreme cases, when conditions are ideal for the fungus to spread quickly, plants can die within 10 days. If these symptoms occur in a plant, loosen the soil around the base of the plant with a hand trowel or shovel and remove the plant from the soil.
A yellow leaf has lost its chlorophyll (pigment) and it can't turn green again even after you correct the problem. Don't worry, if the plant regains its health, it's possible that new leaves will fill in during the next growing season. Growing plants is always a matter of patience.
However, Epsom salt can still help a tomato plant where the soil is too alkaline or one that has been overwatered. In this way, it helps boost absorption as well as improving photosynthesis in the existing foliage.
The main ways to make soil dry faster are to increase light, heat, and ventilation for your plant, ensure the soil and pot are draining well, and choose an appropriately sized pot for your plant. Consider moving to a pot made of a porous material such as terracotta, and make sure to drain the pot well after watering.
If the soil is wet, it's overwatered - if it's dry, it's underwatered. Browning edges: Another symptom that can go both ways. Determine which by feeling the leaf showing browning: if it feels crispy and light, it is underwatered. If it feels soft and limp, it is overwatered.
As for the leaves that still have brown tips, you can snip the dead parts away with a pair of scissors without hurting the plant. For some plants that have long, strap-like foliage, such as dracaena or spider plant, make your cuts at an angle to imitate the natural shape of the leaves.
Make a habit of checking on your houseplants at least once a week to see if they need a drink. The best way to tell if your plants need water is to stick your finger about an inch into the potting mix—if it feels dry, break out the watering can. If you detect dampness, check back again in a day or two.
The brown leaf tips will not turn back to green but you can trim the brown edges to get the plant back to looking healthy. Find out more here. If your are noticing brown patches all over the leaves, this could also be a sign of overwatering.
Stop Watering the Plant
But stopping your watering is always the first step. If you're overwatering, you'll likely notice that the soil is wet, so you want to make sure that soil is bone dry before you're ready to break out the watering can again.
Place the container in the water and let it sit for about 15 minutes so that the soil can soak up all the moisture it needs. Larger containers need to sit for a bit longer, and smaller containers for bit less time. Keep an eye on things. If the soil soaks up all of it during those 15 minutes, add more.
Hydrogen peroxide can help to control fungal growth and fungal infection, such as root rot, by preventing the growth of fungi. It can also help kill fungus and bacteria on plant roots.
Unfortunately, if the root rot is left for too long and there are no remaining healthy roots, your plant can't recover.