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July 8, 2020

8 Advantages of Growing Cannabis/Hemp Using Seeds of Clones (Infographic)

 

(scroll to bottom to view/download the infographic)

How To Start Growing Cannabis

When the time comes to start a new batch of plants, there are essentially two main methods a grower can choose – either seeds or clones. The most common method is to make clones, or genetically identical copies of a “mother” plant. Cloning involves cutting off a piece of stem with some leaves, then planting it under conditions which make the stem grow roots and eventually a whole new plant. The second method, using seeds, is probably what people typically think of when growing plants. That’s because you can buy packs of seeds for vegetables or almost any other plant at the grocery store. Almost all major crops are grown from seed, and for good reasons. Modern agriculture has benefited from years of science that enables breeders to produce consistent batches of seeds; however, cannabis breeders haven’t had those same tools available, until very recently. An example of a technology that helps breeders speed up development of new strains is dna testing, like what we offer here at delta leaf.

Advantages of Seeds and Clones

Compared to clones made using traditional methods, seeds produce plants that grow larger and are more disease resistant. Growing from seed also eliminates the risk of transferring “stowaway” pests such as mildew and gnats, which can show their face and cripple your garden after months of work. Plants grown from seed are reported to be heartier and larger because they establish what’s called a taproot, which is the large central root that pokes out of a seed when it first germinates. The taproot grows straight down, anchoring the plant and sprouting all the lateral roots that extend outward. While clones might seem to save time because they’re bigger when they enter your garden, it’s not hard to plan ahead so that you have seedlings ready of similar size when you would normally buy or start new clones for your next grow cycle. When proper planning is used, seeds can easily replace clones in grow operations with high turnover (frequent harvests). Using Plant DNA Sex Testing also drastically improves the cost-efficiency of growing from seed.

Recently germinated cannabis seeds. The first root that emerges will eventually form the taproot.

Recently germinated cannabis seeds. The first root that emerges will eventually form the taproot.

A batch of cannabis clones. Notice how the leaves have been cut, which stimulates root growth.

A batch of cannabis clones. Notice how the leaves have been cut, which stimulates root growth.
Plants that are started from seed have also been reported to produce a larger harvest than clones that are started at a comparable stage. Finally, the most important aspect of plant health that is affected by cloning is the acceleration of senescence (deterioration due to aging). Each time a clone is cut from a mother plant, it creates a minor stress of infection and tissue damage that accumulates negative consequences over time. Worse, if a clone is taken from a clone (which must be done after a mother becomes exhausted), then senescence will only be accelerated further each generation you get away from the original seed. The multitude of advantages that seeds offer regarding plant health and vigor make them invaluable to many growers.

Young cannabis plants growing on a commercial farm.

Young cannabis plants growing on a commercial farm. Can you tell whether these were started from seeds or clones?

Seeds vs. Tissue Culture

Many of the disadvantages inherent to clone growing can be overcome using plant tissue culture, however, this requires costly infrastructure and continuous maintenance of culture stocks. Cannabis plants grow very rapidly and a single plant is able to produce thousands of seeds. These factors diminish the potential commercial benefits of using tissue culture (a.k.a. micropropagation) to supply clone stocks. Further, seeds are stable for long periods of time under a wide variety of environmental conditions and are easily germinated with high success rates. An individual seed also requires less space to store it than a micro-propagated plant. When consistent genetics become available as seed stock, the cannabis industry will no longer be reliant on clones to produce a consistent product. The hemp industry is already far ahead in terms of breeding certified varieties​ as well as being dominated primarily by seed growers. Both of these methods (seed production and tissue culture) can produce disease-free and genetically predictable starting points; therefore, overhead costs of maintaining seed stocks vs. maintaining tissue culture stocks will become the major factor in determining how cannabis genetics are propagated in the future – and the clear winner is seeds.

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