The soil you want for your indoor plants should be composed of peat, perlite and vermiculite. These mixes are soilless mix, which will absorb the moisture very well, but also dries very quickly. If the plants were in their natural environment, the temperature difference between day and night is about 10 degrees F. Garden plants prefer the indoor humidity of about 50 per cent or more, but if indoor air is drier than 35 or 40 per cent of the water will not be able to penetrate their roots . The humidity in winter is generally very low so misting your indoor plants help them survive. More irrigation of crops covered kill more than anything else, it is best to check the soil before watering, if you look down 1 / 2 inch to 1 inch deep and dry, irrigation will.

Lighting
Most indoor plants need good lighting. Darker leaved plants usually don’t need as much light as others.
Here are the varieties of plants (usually those that only need medium to low light) that are known to be suitable for indoor gardening:
a. Philodendrons
b. Boston ferns
c. African violets
d. Cyclamens
e. Creeping Fig

Watering
A common fault most people make in indoor gardening is they have a tendency to over-water the plants, which may direct to rotting roots.  Make sure to research the type of plant you have, for the reason that each kind of plant varies on their watering needs.

Potting
Select good quality and attractive container for your indoor plant.

Humidity
In indoor gardening, humidity is a big issue.  During mornings, you could shower the plants with water for their much-needed moisture.

Fertilization
Just like watering, fertilizing depends on the kind of plant.  If you have managed to provide your indoor garden with the right amount of light, water and humidity, fertilization may not need much mind. A good indoor fertilizer can be bought from most home depot or hardware stores. Orchids need the special fertilizer available.

1.  Watering
Overwatering kills most houseplants. Looks can be deceptive, so to see if your soil is dry enough to water, try the finger test.  If the soil is damp, don’t water it.

2.  Feeding
Foliage plants usually have high nitrogen needs, while flowering plants, K2O is needed. Slow release fertilizers can be mixed with the compost.  However, certain plants like cacti and orchids need special fertilizer.  Feed plants during their most active growth period.

3.  Lighting
Plants like Sanseveria and Aspidistra require no sun.  Spider plants need semi-shade.  Check the label to see what your plant needs.

4.  Temperature
Houseplants can survive in cool or warm temperatures, but drastic fluctuations of temperature may not be good for them.  One thing that most plants cannot survive is gas heating. If you have a plant that likes warm conditions, don’t put it near an air conditioner in the summer.

5.  Humidity
Some houseplants require a humid environment. One tip to maximize humidity is to put the pot inside a larger pot and fill in the gaps with stones or compost to keep in the moisture.  Grouping plants together often creates a microclimate that they will benefit from.

6.  Re-potting
Some plants require re-potting for optimum growth but there are others that resent having their roots disturbed. One way to check if your plant needs re-potting is to turn it upside down.  Tap the pot to release the plant and check its roots.  If roots are all you see, then re-pot. Sometimes the roots will come out of the pot. You should either cut them off or re-pot the plant.

Indoor plants not only add to the beauty of your decor, but also give much pleasure to  the indoor gardener.

When picking out plants for indoor gardening, make sure the plants are adaptable and will be able to thrive in the conditions and setting in your house. Consider how much time you will be able to spend caring for the plants, how much light your house offers, and also how much money you want to spend on your indoor garden. If you are on a low budget, start with seeds or cuttings. If you have a little more money to dish out you can buy a plant that is already grown. Herb gardens are a good thing for indoor gardening; they are both attractive and edible. They will grow pretty quick and you won’t have to wait a long time to see results. Some popular herbs, especially for cooking, are chives, dill, sage, thyme, and oregano.

When indoor gardening, consider the amount of experience you have before choosing a plant. There are some plants that are stronger and harder to kill and therefore better for a novice gardener. Examples are Fatsia, Cyperus, Scandens, Popular Succulents, Coleus, and Bromeliads.

Some things, such as the basic rules of maintaining plants, are different in indoor gardening that in a regular outdoor setting. Since plants won’t get the sunlight they do outdoors, lighting is essential. You need to know exactly how much light your plants need and pick plants that only need medium to low light, such as ferns or Philodendrons, unless you plan to supply artificial lighting. If you buy a plant already grown, wherever you get it probably has better lighting than your house so you will need to “condition” your plant and gradually reduce the light it receives. Once you get the plant inside, make sure and rotate the plant to encourage upright growth.

Just because you are indoor gardening, don’t think the plants don’t have to have water; they still do. How often you water, once again, depends on what type of plant you have. Make sure the water can drain out of the bottom of the pot and try to use water that is about the same as the temperature of the room. Also pay attention to temperature in your house in order to ensure healthy plants. A 10-15 degree range won’t hurt any plants, but rapid changes could cause damage.

Indoor gardening is not all that difficult; in fact, it is pretty much the same as outdoor. There are even some advantages to indoor gardening. For example, you won’t have to worry as much about bugs and insects bothering your plants. You also won’t have to worry about wind or frost reeking havoc on your garden.

Source: Things You Must Consider before Starting Indoor Gardening