How to Know Which Plants to Grow

There are more cannabis cultivars available now than ever before through seed banks and nurseries in Europe and North America.

Growing from seed has its advantages, but also some issues. Seeds are easier to transport and store than cuttings (clones) from a nursery. Unlike clones, cannabis grown from seed is not genetically identical. The degree of homogeneity varies from breeder to breeder. Although plants of the same variety will be closely related, only skilled breeders can create a uniform crop. Starting plants from seed results in decreased uniformity in the canopy, which is undesirable because it can reduce yield in larger operations. Home growers and those with smaller farms may not mind the decreased uniformity in the crop.

Large-scale farmers are more likely to prefer uniformity, so choosing varieties from a nursery that takes cuttings from mother plants or from tissue culture will help provide those identical genetics that drive uniformity in the canopy.

Whether growing from seeds or from clones, choosing the right cultivar is paramount because they differ not only in their effects but also in how they grow.

Cultivar vs. Strain

The word “cultivar” is derived from “cultivated variety.” Although in popular culture cannabis cultivars are referred to as “strains,” the term “strain” is more appropriately used when referencing viruses, bacteria, or fungi. The use of “strains” in the cannabis industry is widely accepted and understood, however. This book uses “varieties” to refer to groups of related plants and the term “cultivar” to refer to specific varieties that are named landraces or the result of a dedicated breeding program.

Cultivars that do best in outdoor gardens tend to need more light than cultivars that grow better indoors. Some cultivars have very little branching, while others prefer to spread their branches and leaves horizontally. Some are heavy yielders with large colas that will need support as the flowers approach final maturity.

While some varieties may finish in 50 days, it can take as long as 12 weeks before the plant can be harvested. Choosing the variety of cannabis best suited to the grower’s goals can be a daunting task; however, it almost always is a pleasurable one. The right variety is the variety of cannabis that meets those goals, whether they are the plants’ medicinal properties, style of growing, taste, aroma, or any other trait desired by the breeder. There is no single perfect variety of cannabis other than the variety that works perfectly for the grower.

Choosing Cultivars

Choosing which cultivar to grow is one of the most important decisions to make when designing a garden. The two most important factors are the quality of the effects and suitability for the growing environment. 

Cannabis is particularly easy to breed because it is dioecious, meaning unlike almost all other annual plants, plants are either male or female. This makes it easy to control pollination; separate all males from the females and only use pollen from selected males to pollinate females. Cannabis is wind-pollinated, so a male in proximity to a female plant will pollinate it. Flowers can also be hand pollinated. For this reason, it is relatively easy for a grower to experiment with breeding.

Compare cannabis breeding to tomatoes. Not only does each tomato plant carry both sexes, but tomatoes have “perfect” flowers, meaning each flower carries both sexes. To breed them, the stamen from the designated female must be removed before it matures, which requires tweezers and a sharp eye. Then pollen must be collected from the candidate male, which is painstaking.

As a result of the ease of breeding there are literally thousands of companies producing cannabis seed for commercial sales, so obtaining seeds has never been easier. They are available over the internet as well as in dispensaries. Many of these companies advertise in magazines that feature cultivation articles.

Plant Size

The height and spread of the canopy are two varietal characteristics to consider when choosing which cultivar works best in the garden. This is particularly important whether the garden is indoors or outdoors. Sativa-dominant cultivars tend to grow taller and stretch farther than indicas. An outdoor garden with abundant sun and plenty of room for plants to spread out works well with strong sativa varieties such as Sour Diesel, Lemon Skunk, Vanilla Frosting, Lemon Tree, Runtz, Orange Creamsicle, or Lemongrass. These tall cultivars thrive in outdoor gardens with no height restrictions, and the extra intensity of direct sunlight keeps the plants from stretching too much. If they are pruned early in vegetative growth, they will bush out more rather than grow tall. The higher light intensity promotes shorter branching and thus denser buds.

Yield

Once the size and maturation speed of the varieties have been decided, maximizing yields is often the next decision that needs to be considered when choosing which cultivar works best for a garden. High-yielding crops provide more medicine after harvest. These varieties are vigorous growers and will usually have higher cannabinoid potencies as well.

Maturation speed has a negative correlation with crop yield. In other words, the faster the maturation time, the lower the yield tends to be, and vice versa. Slower maturing varieties have more time to develop flowers, and thus the yields tend to be larger. However, a quick maturation time and low yield are not mutually exclusive. If it is a necessity to have a quick maturation time, the resulting smaller plants can be more densely planted to fill out the given canopy with more buds.

MORE ON GROWING CANNABIS GUIDE HERE