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Starter cubes, used by hydroponic growers, as well as soil gardeners, are comfortable growing media for starting seeds. Made of inert material, starter cubes provide perfect support to the plant and its rhizomes. The cubes are capable of retaining water, but they do not supply a plant with any nutrients, unless the latter are dissolved in the water. Nowadays, there are 4 types of starter cubes: Organo-Cubes, Oasis cubes, Rockwool and “peat pots”. The most well loved among the gardeners are the first three kinds of cubes (Organo-Cubes, Oasis cubes and Rockwool), while “peat pots” lose their popularity due to their tendency to accumulate too much water, which can spoil the seeds and the seedlings. Oasis cubes, Rockwool, and Organo-Cubes, on the other hand, retain water along with enough air, which prevents the medium to be too moist.

Preparing hydroponics starter cubes for the use depends on the type of the cube you have. For example, Organo-Cubes are ready for use, while Oasis cubes and Peat pots should be soaked in water (with pH adjusted to 6 – 6.5) before use. As soon as the cubes are saturated with water, they should be left to drain a bit, and then they are ready to be used. Rockwool is different, since it has high pH. Therefore, it should be soaked in water with pH adjusted to 5.0 in order for this acid solution to be balanced to the pH level required for the plants normal growing. These cubes should be soaked in water approximately for 24 hours, followed by the drainage prior to the use. 

Having done these easy manipulations, the seeds can now be planted. Small holes about ¼ to ½ inch deep should be made in the cube with a tip of a pencil or a pen. Then seeds may be place into the holes and covered with some cube material from around those small openings.

It is best to keep the seed cubes moist, but not wet, always preventing them from staying in the water. The cubes do not need light until the seeds germinate. Similarly, no nutrients are necessary for the plants until they have their first right leaves developed. In this case a diluted nutrient solution

Generating between 65 to 115 lumens of light per each watt of consumed electricity, metal halide grow light lamps are considered to have high efficiency. MH lights produce light, which is very close to the natural sunlight with the rich blue spectrum. Due to this, MH lamps support vegetative growing in the most desired way – when plants have many leaves on the stem with small internodes.

Structurally, metal halide lamp is a vacuum glass tube. There is also an arc tube inside, filled with mercury and other metals in iodine form. Under the influence of electric current, those metals start to generate light and heat intensively. Though metal halide bulbs can be either transparent or coated with phosphorus, the first type is more preferred for the indoor gardening, since it produces very bright light.

There are different sizes of metal halide lamps, starting from 70watts and finishing with 1500 watts. But 250w, 400w and 1000w are modifications, most commonly used in hydroponics systems gardening. In order to make MH light to work, it is necessary to use a ballast, designed for a particular bulb size. Ballast is, in fact, a transformer, which decreases voltage to some predefined amount.

The lamps can work only in the positions they were designed for. Those marked with BU or BD should be used only in vertical position; while those lamps, which carry HOR sign, are for horizontal application. Besides, there are also universal (U) lamps, which can operate in either position. 

There are also many different styles of metal halide lamps available on the market today. Along with typical or regular MH bulbs, there are also Super Bulbs, which can produce up to 10-12% more light than ordinary bulbs.

Regular metal halide bulbs should be replaced after about 18 months or 9500-10000 hours of use. Super bulbs are less durable and should be replaced more frequently – approximately after 12 months or 6500 hours of use. These recommendations apply if grow lights will work 18 hours daily.

Key Facts on Hydroponics

Hydroponic plants do not require soil to grow in. They use different growing media instead. All the required nutrients are supplied through nutrient solution. Hydroponic system allows cultivation of plants, irrespectively to climate and environmental condition. Hydroponic system allows increasing the density of plants significantly (up to 3 times higher in comparison with traditional soil gardens). It may be surprising but hydroponic plants consume considerable less water than those, growing in soil. Since soil is not used in hydroponic systems, there is no need to worry about crops rotation. Hydroponic plants are healthier, because there are no or very small risks for them to get infected by parasites, living in soil. Hydroponic gardening does not depend on seasons of the year. You can grow plants and gather harvest all year round.

Hydroponics in the Present

Thanks to many technological achievements and innovations, hydroponic growing has already become much more effective, convenient and affordable. Plastic, used for manufacturing of hydroponic equipment, such as plumbing products, fittings, growing pots and containers, etc., made it possible to lower the cost of hydroponic systems significantly.

Multiple electronic devices, such as pumps, timers and monitors, have made hydroponic growing a fully automated process. Furthermore, the hydroponic plants themselves have evolved significantly, ensuring high yield results even if used under the most extreme environmental conditions, for example, at the submarines.

Hydroponics in the Future

The next goal of hydroponics developers is to make indoor gardening eco-friendly and more energy-saving. In this regard, current achievements in the development of solar heating systems look very promising. On the other hand, current innovations open new opportunities for designing new growing light systems with higher lumen output, better spectrum profile and lower electricity consumption. In the long run, hydroponic systems may allow increasing the amount of grown plants to completely satisfy the needs of people in food products, without using additional natural resources and soil.

Furthermore, maybe in the nearest future hydroponic systems, which have already been tested in space on the space stations, will even become another valuable step in the space exploration by the humans.

Soil less Mixtures

There is a fantastic amount of soil less mixtures available, which contain different ingredients. Sphagnum moss, perlite, and vermiculite are the most widely spread hydroponics components, used in such mixtures.

Being organic, soil less growing media are usually used for container gardening wick systems or on-recovery drip systems. It is also possible to use soil less mixtures in recovery systems, but, it is necessary to remember that because of very fine particles in such mixtures, they can clog tubes, pumps and drip emitters, when used without a excellent filtration system. By the way, according to the urban gardeners, one can use panty hose as a filter: just fit it to the return line and to the pump inlet, and all the tiny particles will be filtered out.

Most soil less mixes form a excellent growing medium for multiple hydroponic and organic gardens, because they can hold water well, have fantastic wicking action, and, at the same time, they provide a reasonable amount of air to the roots of growing plants.

Coconut Fiber

The popularity of coconut fiber as growing medium increases rapidly around the world. Being the first really organic growing medium, providing highest performance for hydroponic systems, coconut fiber may soon become the most well loved growing medium ever. It is fascinating to note that coconut fiber is, really, a waste product, which contains the powdered husks of coconuts.

In comparison to rockwool, coconut fiber is characterized with higher oxygen capacity and water retaining. These features are vital advantages for hydroponic systems with intermittent watering cycles.

Coconut fiber also contains a lot of root stimulating hormones, thus offering some protection against fungus infestation and other root diseases. The mixture of 50% coconut fiber and 50% expanded clay pellets is considered to be the perfect growing medium.

But, it is necessary to underline one precaution when buying coconut fiber. Avoid purchasing a low grade coconut fiber, which is very fine grained and contains a high level of sea-salts. Such coconut fiber will have negative and disappointing effect on hydroponic system.

The most widely-spread growing medium is, perhaps, rockwool. Originally used for insulation purposes and also known as mineral insulation, rockwool was first used as growing medium by Dane gardeners. Now, it is frequently used for drip-style indoor gardens around the globe.

Rockwool is produced by a process similar to making cotton candy: a particular mixture of sand and rock is melted and then turned into fibers by spinning the mixture to form products of multiple shapes and dimensions, from 1″ starter cubes and up to large slabs of  3″x12″x36″ in size. The variety of available forms and sizes turns rockwool into one of the most widely-used growing mediums.

Key advantages, as well as disadvantages, of this well loved growing medium are listed below.

Rockwool’s Strong Points

HOLDING WATeR – rockwool as a growing medium in hydroponics systems is capable of holding a large amount of water. This makes an additional protection for situations, when water is not supplied because of power outages or failures in pumping or other gardening equipment.

ACCUMULATING AIR – up to 18 % of air are constantly kept by rockwool. Due to this capability, there is a very small risk to over water rockwool; besides, the plants are always supplied with enough amount of oxygen.

MULTIPLE SHAPES AND SIZES AVAILABLE – whether it is a small 1″ cube for seeds propagation or a large 3x12x36 inches slab for huge plant, rockwool offers a wide variety of shapes and sizes to choose from. Besides, loose rockwool is also available, designed for filling different plant containers.

NO DUST AND EASY TO USE – since rockwool maintains its form nearly perfectly, it cannot be scattered accidentally. Besides, usually packed into plastic rockwool is a very clean material that is easy and comfortable to work with.

Rockwool’s Weak Points

NOT A “GREEN” MATERIAL – rockwool is claimed to be not environment-friendly material, because of its nearly indefinite time of breakdown.

HEALTH HAZARDS – rockwool particles and fibers pose serious health danger, especially for human lungs. That is why it is necessary to wear a protective dust mask, while working with rockwoll.

pH PROBLEMS – because of rockwool’s high pH level, it is necessary to balance pH level in the nutrient solution properly and make it suitable for the plants, you are growing. In general, the use of rockwool requires more routine work to keep pH level of your nutrient solution at steady level.

LONG PRE-SOAK PERIOD – before rockwool can be used in the hydroponic system, it should be soaked for at least 24 hours beforehand. Other growing media usually do not require pre-soaking, it is enough just to well-water them.