I gave big makeover to my terrace garden by planting lot more vegetables. I was thrilled to see both bottle guard and beans coming up so well. And ofcourse I have been very careful to feed water, pest control and nutrients and was happy to see little bottle guards growing by the day. One of the most frustrating thing in gardening/farming, when you work so hard in caring and it doesn’t end up perfect! I have noticed that in the past couple of days that the leaves on it have begun to turn yellowish and started drying from edges to inside.
I was able to chat with our horticulturalist, to ask him why this is happening. He said that it is very common for leaves on plants to turn yellow due to stress to the plant, which can be caused many different ways. Since this is such a common topic for garden lovers, I thought I’d share what I learned on how to prevent plants from turning yellow. Here’s to keeping plants happy and healthy!
The most common reason that plants’ leaves turn yellow is because of moisture stress, which can be from either over watering or under watering. If you have a plant that has yellow leaves, check the soil in the pot to see if the soil is dry.
If you believe that the problem is due to under watering, water the plant more often and consider letting the pot sit on a dish to recollect any water that has overflowed, so that the roots can absorb the extra water.
On the other hand, over watering can contribute to the leaves turning yellow as well. If you feel the soil and it is too wet then you know that you have been putting too much water on the plant. In this case the solution is simple in that you should not add as much water or water less frequently.
Another common reason that plants’ leaves turn yellow is because not enough light is reaching the plant. This occurs because the rate of photosynthesis is limited in low light, but as the light is increased, photosynthesis increases as well.
The temperature contributes to the colour of the leaves as well, when it is either too hot or too cold. In terms of the cold temperatures, cold drafts on most tropical plants will contribute to the yellowing of the leaves. If it is not periodic temperature change like a draft, the leaves will most likely be brown if they are exposed to prolonged cold temperatures, especially when they are positioned near an air conditioner.
The yellowing of your plants can also be a good indication of their nutrition. Specifically, if there is an strange pattern to the yellowing, like if the veins on the leaves are green and the tissue is yellow then it is almost always a nutrient problem.
Common sources of nutrient issues are under-fertilizing or over-fertilizing, so it is important to use fertilizer as per usage instructions.
Frequently people tend to use too much fertilizer on their plants to make them grow faster, but what it actually does is create a toxic environment which “burns” the leaves out causing them to turn yellow.
In addition to the problems listed above, other conditions that lead to the yellowing of the leaves include infectious diseases (fungi or bacteria), poor soil, natural aging of the plant and plant destroying pests.
Well you now understand some of the common reasons for leaves turning yellow, so you can now carefully balance the mentioned inputs to make your plants happy.
Reference : Why Are My Plants Turning Yellow? by Jack Myers .