If you're a plant killer, you just need to know some basic information to become a plant lover!
Make sure the container or pot you are using is big enough. Plants need room to grow. A sure fire plant killer is allowing the roots to become crowded. Otherwise they get all claustrophobic and nobody wants that.
Maintain a fairly steady temperature. If you're cold, your plant is cold, too. Avoid putting your green friends in drafty places. If you think it's chilly, so do they.
Shed some light on the subject. Put your plants as near to sunny windows as possible for optimum growth. If you have an area that's sunny and warm in your house, this is the perfect place for some lovely plants. If you notice your plant becoming thin and reaching toward the light,it needs to be closer to the sunshine.
Water correctly. Watering can cause perfectly lovely people to become plant serial killers. They either water too little or too much. Here's how to tell when and how much to water. Stick your finger in the dirt about an inch or so. In most cases, water your plant when the soil is slightly dry and give it enough water so that it comes out the holes at the bottom of your container somewhat.
Fertilize. Most avid plant growers do use some sort of fertilizer, but that's a matter of preference. If you choose to use fertilizer, visit your local greenhouse and ask questions about what to use and how much.
If you're not sure how much to water or how often, purchase a hydrometer. These are fairly inexpensive and can be found in most plant care sections of bigger stores. Basically, it's a metal probe that you stick in the soil of your plant, then the gauge shows whether plant is dry, wet etc.
If you are seriously no good at this, buy fake plants--no one will know that they aren't real! They can be big or even small!