The urban gardener asked:

hydroponic plants receive all the nutrients they need for growing and fruiting from the growing liquid with all the nutrients dissolved in it. Hydroponic nutrients are available in great variety at specialized hydroponic stores. By the way, both chemical nutrients and organic nutrients can be used for the needs of hydroponic gardening. The only thing to remember is that organic fertilizers require more skills, time, and attention to use them effectively.

Hydroponic gardening allows anyone to grow organic vegetables, fruits, and flowers. A little research, learning and training, combined with enthusiasm, will soon bring the first success in hydroponics to you.

Today, there are many ready-made hydroponic systems available on the market. They are not too expensive, but such systems can really help to make an easy start in hydroponic gardening. For the beginning gardeners it is even recommended to choose simple inexpensive hydroponic systems – they are enough to give you the necessary experience. Of course, you can always build you own system to suit all your particular growing conditions and requirements, when you have enough experience and understanding of how hydroponic system works.

If organized properly, hydroponics gardening can even be easier than traditional plants growing. For example, with hydroponic system it is much easier and less time-consuming to test and maintain the necessary pH level in comparison to the regular soil gardening, where even the pH level testing can be a very challenging task, not speaking about maintaining it on the required steady level.

After all, it is necessary to remember, that in spite of the fact that hydroponics differs significantly from traditional gardening, it is nothing but an alternative approach to grow the same fresh, tasty, and healthy food. Just spend some time to research the topic, evaluate all the benefits of hydroponic gardening – and you will see that there are many advantages offered by hydroponics. Growing healthy organic vegetables without polluting and exhausting fertile soils is definitely one of them.

The urban gardener asked:


Complete freedom from environmental factors gives indoor hydroponic gardening its ultimate advantage. All the elements needed for optimum plant growth are provided by the indoor hydroponic gardening system. Light, temperature, pH, CO2 and Oxygen are important factors that should be considered in planning your indoor hydroponic garden system.

 Light and Photosynthesis

 Essential sugars are created by plants through photosynthesis which is the process of converting carbon dioxide, water and nutrients into energy. Light is considered the most important factor because it provides energy for this chemical reaction. Studies show that an increase in light intensity directly increases the amount of sugar produced. This steadily goes up till the saturation point for light is reached by the plant. Increasing the level of light received by the plant should also be considered. Normally, a plant receives around 8-12 hours of sunlight in a day depending on the season. Plant exposure to this amount of light received in a day should be maintained in an indoor hydroponic garden system. Spacing is also important, be sure that they don’t block the light and ensure all plants received equal amount of light.

Plants not receiving enough grow light will have lasting negative effects on its growth even when corrected. Some characteristics are stems which are spindly and elongated leaving them ineffective in supporting plant growth. A decrease in the amount and size of the leaves is also one problem. More damaging effects of improper lighting are a decrease or absence of fruits, decreased overall quality and a change into a yellowish pigmentation for the plant.

Carbon Dioxide also plays a major role in Photosynthesis. Plants utilize the CO2 present in the atmosphere than anything else. CO2 systems are available which increase the levels of CO2 in your indoor hydroponic garden system

Good ventilation should also be considered as they maintain temperature and a steady fresh supply of CO2 and oxygen at all times. Complex setups require more complicated ventilation systems but an oscillating fan set on the same timer as the lights would ensure airflow that eventually allows for optimal plant nutrients in an hydroponic system.

The urban gardener asked:


These are the materials that mimic the soil in everyday gardens. It serves as a support system for your hydroponic indoor garden. They function mainly for anchoring the roots and a reservoir for water and nutrient solutions. Special attention is also placed on aeration or proper plant respiration and drainage. A balance must be kept between keeping the plant nourished and over saturating the roots.

 Types of Growing Mediums

 Choice of a specific growing medium mainly depends on the type of growing system to be used. Certain systems have no mediums used because plant growth is best when roots are suspended in air or water. Improvement made with newer growing medium mixtures has been introduced for optimum plant growth in certain systems. Ideally, an equal mixture of water and air is advised making it available for the roots to utilize at all times. Water by gravity always moves downward through coarse mediums only to be deposited in the bottom of the container. This is eliminated with the use of a hydroponic system as water is constantly circulated in the system. The only system that this would not work would be the Ebb and Flow Systems.

 Clay Pebbles

Recyclables, it can be constantly reused indefinitely reducing upkeep costs for your indoor garden. Size of the pot is one limiting factor as they do not possess good nutrient lifting ability, but effectiveness is enhanced in smaller pots and containers. Another advantage would be their neutral pH and they don’t retain nutrients. Ventilation and aeration are also maximized because of the spaces created between pebbles.

 

Clay pebbles are usually used together with net pots in drain and flood indoor hydroponic gardening systems. Water flow in roots is enhanced by their natural shapes and spaces hey create between them, therefore maximizing the absorption of nutrients. When using the Drip irrigation hydroponic system, use absorbent mediums to provide better retention and nutrient circulation.

 Coconut Fiber

Shredded husks of coconuts as a growing medium has also been growing in popularity. Packaged in a variety of ways like blocks, pellets, cubes and shredded fiber it can be a good substitute for any type of growing medium. It is also commonly mixed with other growing media such as perlite or rockwool.

 Why Use Coconut Fiber as a Growing Medium?

 Coconut fiber is actually a waste product; its ability to be used for other useful means takes a great step towards recycling and environmental awareness. It is the first totally organic medium which could be utilized for indoor hydroponic gardening. It is superior to rockwool in water handling ability and oxygen capacity. Coconut fibers also possess root stimulating hormones and prevent root disease and fungus infection. In its natural state, coconut fibers provide a good and rich medium for the coconut when it lands in the ground.      

Special attention should be given as to the quality of the coconut fiber to be purchased. Low grade quality is not well suited for gardening as they contain high sea salt content and fine grain texture. 

Perlite

Originally used as an additive to aide aeration and improve soil drainage, it has become one of the popular hydroponic growing mediums. Commonly used with a 50/50 mix with vermiculite, it is derived from volcanic glass with holes throughout produced by exposing it to high temperatures created by water bubbles.

 Advantages of Growing with Perlite

 Inexpensive and readily available is one of the causes of its popularity. Used in wick type hydroponic systems because of its aerate nature thereby giving a good wicking action.

 Disadvantages of Growing with Perlite

 Health hazards come with the use of perlite when inhaled, a mask is suggested when working with perlite as a growing medium. A high degree of care and maintenance is also required. Water retention is one of its weakness therefore constant watering is required.

 Vermiculite

Used in conjunction with another growing medium compliments the qualities of the other. A popular and common mix is that with perlite. In a 50/50 mix vermiculites property which is water retention (200 – 300% of its weight in water) complements perlites very porous quality and a balance is achieved.

 Dangers of Using Vermiculite

 Vermiculite can be a health hazard if not handled properly. Due to its nature of containing small amounts of asbestos, it can be very dangerous when inhaled. It easily dries on an individuals fingers when touched even when wet. It is not also practical to reuse because of the rinsing and drying required. Water retention is also a problem, because of its high water retention if not used in pair with another growing medium, root damage is likely and plant death are the result.

 Rockwool

Rockwool specifically made for indoor hydroponic gardening systems. It has remained as one of the popular growing mediums. Transplanting plants when grow too big from their previous containers is also eliminated. When this happens the existing cube with the plant is merely placed on top of a larger cube and the roots would grow through both cubes. Water retention qualities of rockwool is 10 times greater that of water. Its porous nature makes it virtually impossible to over water. Recyclable, it can be used for the next crop by merely rinsing, making it economical and environment friendly.

 Disadvantages of rockwool

 A natural pH found in rockwool is one of its disadvantages, pre-treatment is required before it is used as a growing medium. Methods of lowering its alkaline content includes mixing it with a solution of pH down, trace mineral solutions and a 24 hour fish emulsion and is then rinsed thoroughly. Gloves should be used when handling rockwool because of skin irritation but is not when rockwool is wet.

The urban gardener asked:


A great indoor garden requires a good grow light. It could mean the difference between success and failure. Having the right hydroponic light is the single-most important and costly decision in setting up your garden.

 Hydroponic grow lights come in three main types:

 

Incandescent lights

These are the usual lights found in homes. They are generally a poor choice for garden grown lights because of their limited light spectrum and inefficiency.

HID (High Intensity Discharge) grow lights

Producing more light (up to 10x more lumens/watt than an incandescent light),are more efficient. Drawbacks would be, they produce more heat, generally more expensive than incandescent lights and requires the additional expense and maintenance with ballast. It takes around 100 hours before hydroponic HID grow lights reach their optimum working conditions, or until they reach light intensity and color stability. 

Natural Sunlight

Expense for acquiring artificial lights can be skipped by using sunlight. This is done with the use of solar room, greenhouse or large windows which allows plenty of sunlight. Or you can do this outdoors; hydroponics does not necessarily mean the cultivation of plants indoors but it growing plants without the use of soil.

Basic setup for an indoor garden is 1000w of lighting for and area of 16-25 square feet of plant area. Reflectors and/or light movers should also be considered as they improve efficiency of the indoor hydroponic gardening system. Ballast may also be needed as numerous hydroponic grow lighting require igniting.

 Some Basic Facts

Before plugging in your grow light

Different plants require different levels or types of lighting, this paragraph would deal on some simple know-how on how to make an effective lighting setup. In setting up your garden, it is essential that you determine your growing area in order to determine the best lighting setup for you. Light is an essential factor in the growth of plants, it is important that the lighting solution you chose for your garden is adequate for its size. A poor or ill advised decision would certainly reflect on the quality of plants you produced. Inappropriate budgeting like cost cutting specially on lighting would just prove to be uneconomical and inefficient in the long run.

A general rule for lighting that area coverage is determined by a light wattage output. Reflectors might be used to increase the light area and reach corners but effectiveness is still determined by this formula.

Day and Night Cycles

The type of plant and its stage of growth generally determine the amount of light needed. A common cycle is that with 18 hours of light and 6 hours of darkness which is recommended for its vegetative growth phase.

For seedlings, a continuous light source is needed until the first real leaves appear. When the leaves appear, the regular 18/6 light cycle is used. Fluorescent or incandescent lights are best for seedling because of the low heat and soft light they generate. Automated timers maybe used to ensure consistent light cycles. Inexpensive timers are also available; this can be found any hardware or Home Depot/ Lowe’s type store.

Light and Photosynthesis

The plants exposure to light intensity, duration and light color directly affects the amount of energy needed for photosynthesis. The color of the light, Blue simulates the summer sun, Orange for autumn seem to stimulate photosynthesis best. The light spectrum produced by metal halide bulbs (Blue lights) and high pressure sodium bulbs (red/ orange lights) produce this effects. HID grow lights produce these effects owing to their popularity to hobbyist and professionals. Combination of metal halide and high pressure sodium bulbs provides the complete spectrum of light produced by the sun.

Use Caution When Working with Lights

The combination of water, electricity and chemicals in such a closed-in space makes the grow room one of the most dangerous places in your house. Keep in mind to separate your ballast by elevating it from the water-containing areas of your hydroponic growing system.