If you have a green thumb that means you are good at growing plants. Not everyone can grow plants. You can see that there are people who actually love to grow plants, but none of the plants planted by their hands, do not grow even though they put a lot of effort to see the plant grow. Therefore, having the ability to grow plants is a wonderful ability.
However, just because you already have this ability to grow plants wonderfully does not mean you should pay less attention to them. You have to use the resources you can get to keep your garden healthy and thriving. For example, if you want your lawn to be lush and green all the time you can use the best lawn fertiliser you can find on it while you are watering and taking caring of it every day. 
While you are using fertilisers to make the plants grow better you have to also make sure no plant or insect harms those plants too. Here are two methods to take care of this responsibility.
Using Synthetic Methods
Using synthetic pesticides or weedicides mean you are using a solution that was made in a science laboratory by some scientist. These products are used to imitate their natural counterparts. However, they are aimed at getting higher results. Therefore, if you use them, you will see results faster. Also, most of the time, you have to use a very little amount of such a solution as too much of a solution can end up destroying the plants that you are trying to protect. Most people use these synthetic products to get results faster.
Using Natural Methods
Then, there is the method of putting an end to pests and wild plants by using a natural weed killer or a natural pest killer. Usually, the natural pest killer is an animal that you can attract to the garden to keep the number of harmful insects at a low level. However, nowadays, there are natural pest killers in the market too. These are made of natural ingredients such as natural chilli and garlic so that they can be safely administered on crops that we eat.
If we can use more natural products when we are trying to do pest and wild plant control in our garden, especially in our vegetable garden, we cannot have any side effects by eating crops that were exposed to such solutions. The choice is yours. You can choose either the synthetic methods or the natural methods. That is entirely up to you.