THDC Vertical Grow Tube Technology

THDC's evolutionary Vertical Grow Tube System has several special features not available on competing systems.


  • proprietary tube design allows insertion of continuous grow media strips - strips quickly slide into the tube and allow you to conveniently change and maintain the grow chamber for general cleaning or a change of crop;

  • enclosed air columns of each side of the grow media allow roots to breath, provide even nutrient exchange and minimize anaerobic areas in the grow media;

  • concave planting face helps direct nutrient solution flow and minimize solution leakage;

  • removable transparent vapor hood can be installed over new seedlings or fresh cuttings to balance humidity and air movement around the new resident plant and provide protection from the elements during plant acclamation.

  • vapor hood slots on the planting face allow quick and easy installation and removal of the vapor hood;

  • tubes can be used in vertical or horizontal positions;

  • tubes can be suspended vertically from overhead racks, fixed to vertical supports such as walls, or joined in a free-standing array;

  • convenient end caps correctly position emitter and drainage plumbing fittings.


    • THDC Hydroponic Grow Tubes are specially designed for use with vertically installed hydroponic systems. These grow tubes function as a component in a hydroponic / aeroponic garden system that also includes; nutrient solution reservoir tanks; a pump for circulating the nutrient solution through the system; and a plumbing network of various pipes, hoses, spray nozzles and plumbing fittings as required to contain and direct the nutrient solution flow through the system. THDC grow tubes are compact, self-enclosed, growing enclosures that can be installed on existing surfaces or installed from dedicated supports. Please check the information below for a complete explanation of THDC's proprietary design and the benefits these innovations offer.

    • THDC vertical grow tubes reduce the required system footprint as compared to a system using traditional plant cultivation techniques. A hydroponic system using THDC vertical grow tubes combines the advantages hydroponic NFT and aeroponic misting techniques and reduces or eliminates many of the drawbacks of current DWC and NFT systems. The grower gains flexibility to use a combination of cultivation techniques, thereby maximizing yields per given crop and time frame.

    • THDC vertical grow tubes are manufactured from PVC and have a profile size of approximately 10cm to 12cm. The tubes are available in standard 1.3 meter lengths. Other customs lengths are possible depending on quantities, the mounting space available and the power of the nutrient delivery. In most installations, the tubes are fitted top and bottom with a cap and hose fittings that connect the tube to the plumbing system of the installation.

  • THDC grow tube profile includes a front planting face, a back mounting face and angular side faces. The front planting face is designed as a concave surface with a series of round or oblong planting ports cut at intervals along in planting face. These planting ports allow the insertion of plants into the grow media housed in the tube. Required spacing for plants on the planting face is variable dependent on plant type and maintenance requirements. Ridges on either side of the grow face act as splash guards to help prevent errant nutrient solution leaking from the planting ports.

  • Narrow slots on either side of the planting face are used to secure a vapor barrier hood that can be fitted over the planting face to shield new plants during the incubation and rooting period.

  • The grow tube is partitioned internally three cavities – a central cavity that holds the grow media strips which will anchor plant roots, and air column cavities on either side of the grow media that will provide root zone aeration and humidity protection.

  • A variety of grow media materials can be fitted into the grow tubes including coconut coir, synthetic wool, etc. Internal barrier walls insure that the grow media will be held in place if the grow tube is moved or placed in positions other than vertical position.

  • Air columns on either side of the grow media ensure that plant roots receive adequate aeration and humidity. These columns act as aeration zones that allow the plant roots to breathe and aerate as they grow. High humidity and aeration is maintained inside the grow tube due to the constant flow of nutrient solution through the grow media.

  • A emitter or dripper is fixed centrally above the grow media column that will emit nutrient solution evenly over the width of the grow media.

  • Installed vertically, the system utilizes gravity to channel any nutrient solution introduced into the tube and back to the drainage plumbing of the system. Plants are inserted into the planting ports and nutrient solution is circulated through the system. Nutrient solution trickles down through the grow tube, over the plant roots; providing required nutrients the roots of the resident plants.

  • As the plants mature, roots grow out of the grow media and into the air columns. In some installations, spray, dripper or misting nozzles are installed into the side faces of the grow tube at various locations along the vertical length. These are used to emit nutrient solution on to the exposed roots. Runoff nutrient solution is channeled through the grow tube and back to the drainage plumbing of the system.

  • At different stages of development, plant growth can be better optimized by using different hydroponic and aeroponic techniques. As a seedling or cutting, the plant requires a different application of nutrient solution than it would if it were more matured with a equally more developed root and stem system. At the start, a hydroponic technique may be used where the cutting or seedling is bathe in nutrient solution. Later a aeroponic misting technique might be more effective that subject the root system to misting and wet/dry, wet/dry cycles. THDC grow tubes allow the grower to use both hydroponic NFT and aeroponic misting solution delivery techniques without altering the position of the plant or disturbing the root system.. The two techniques can be configured to act in unison or independently. The grower has flexibility to use the most suitable techniques for nutrient delivery depending the type of crop, the crop's stage of development, the weather elements, the location, the availability of support systems and the time frame required and other factors.

  • THDC vertical grow systems help eliminate some of the problems common to horizontal NFT systems. The flow channels in horizontal systems may become restricted or blocked by root mass. A vertical flow path for nutrient solution work to minimize the damming effects of root growth in the tube and allow nutrient solution to pass through the grow tube relatively unobstructed. The internal structure in THDC tubes further insures that any biological material is washed through the grow tube without restricting nutrient solution flow to other parts of the tube. This prevents anaerobic areas forming in the tube around the root zone of the resident plants.


  • Designed to minimize nutrient solution leakage from the system. The planting face is formed concave to the interior of the tube to direct nutrient solution to the internal cavity of the tube. The splash guards on the side of the planting face are raised sufficient height to direct any nutrient solution that escapes from the tube along the exterior length of the tube and back to the drainage plumbing installed at the bottom.
  • Can be conveniently fitted with a transparent, thin vapor hood over the planting face to trap humidity around seedlings and plant cuttings and protect them against the drying effect of wind. This provides an stable, high humidity environment for the plant during the incubation and rooting phase. It minimizes the inconvenience and time required to transplant seedlings and cuttings into the system. The vapor hood allows the grower to start plants directly in the production system and still provides the starting plant with an stable environment for rooting.
  • Can be configured with spay or misting nozzles at various positions along the length of the tube. Nutrient solution can be emitted through the nozzles on to the sides grow media and plant roots. Excess or runoff nutrient solution is channeled through the tube toward the bottom and back to the drainage plumbing of the system.
  • Can be installed in gravity fed systems or direct delivery systems.
  • Easily suspended from overhead supports; fixed to walls, poles or other vertical support structures; or joined in arrays to become independent standing systems using the stability provided by the attached member. They allow for deployments of a few tubes for rooftop and balcony hobby gardening, large scale of several tens or hundreds of grow tubes for greenhouse deployment and for decorative living wall designs as well as vertical plant production indoors and outdoors for a variety of purposes.
  • Convenient to install, easy to take down and easy to transport. The crop can be moved to different locations for grow out, preparation or sale while allowing the grower to continue supplying nutrient solution to the resident plants. Crops do not need to be harvested and shipped to point of sale or preparation. This flexibility allows the grower to provide consumers with the experience of picking and harvesting vegetables, herbs and greens that are still on the vine.