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Cannabis mother plants are an ideal way to source cuttings of your favourite specimens. Discover the art of selecting, growing, and maintaining perfect mother plants below.
An in-depth guide on cannabis mother plants.
Contents:
When you find a cannabis strain that rocks your world, you’ll want to experience it over and over again. The easiest way to repeat a favourite discovery is by taking clones from a mother plant. Using mothers has a number of benefits. Strain characteristics are known and repeatable, females are guaranteed, and growth is more or less standardised. Mothers can be kept alive indefinitely when well-maintained, and enjoyed for years.
When timed right, cloning mother plants can mean harvesting one day and having more plants ready to go the next. With overlapping growing schedules, you can always have plants in flower—with more ready at a moment’s notice.
Mother plants are ideal sources for infant plants when using the sea of green (SOG) technique. Similar-sized clones will create a homogeneous canopy with no tall or short phenotypes to consider, thus optimising light exposure and yield potential.
Mother plants can be as big as you need them to be. Ambitious growers with lots of space will need large mothers for lots of clones. Smaller spaces that can only fit a few plants will only need a small mother plant to suit. Cannabis can easily be manipulated to suit your personal circumstances.
Consistent characteristics are guaranteed every time you grow cuttings. Commercial growers appreciate the standardisation; domestic growers appreciate the reliable performance.
There is no risk of males with clones, making for an efficient grow space filled exclusively with females.
While keeping a mother plant might sound like it requires a lot of space and gear, it is actually quite simple. Here’s a list of all the things you’ll need to grow a healthy mother plant:
Small grow tents work great, but you can also keep your mother growing in a cupboard or closet. Some growers even use the bonsai method to grow small, healthy mother plants in tight spaces.
Most growers use low-consumption fluorescent lamps of roughly 100–150W to keep their plants growing at a healthy, manageable rate. If you want to boost the growth of your plants, or you’re keeping several mothers at once, we recommend switching to metal halide lights.
We recommend using a 100–200cm³ extractor fan to renew the air in your grow room. You should also consider using a small oscillating fan to improve air circulation around your mother plant.
It’s extremely helpful to have a timer to set the photoperiod for your plants, and a thermo-hygrometer to keep an eye on the temperature and humidity in your grow space.
Mother plants can be grown from seed or clone, and are kept in vegetation throughout their entire life. Choosing a mother plant requires some preparation when the original plants are grown from seed. It is a wait-and-see game.
Keeping detailed records and pictures of growth characteristics and effects ensures things don’t get confused. Choose the most outstanding plant from a single-strain crop or the best of a multi-strain crop. By week two of flowering, males will have revealed themselves and can be disposed of.
But, how do you know which of your plants is worth keeping around as a mother?
In an ideal world, you want to pick a plant that performs exceptionally on all of these fronts. Keep in mind, however, that plants aren’t perfect, and you’ll likely have to make some compromises when it comes to choosing which one to keep as a mother. The final decision will come down to the traits you value most in a plant.
When you germinate a batch of cannabis seeds, the plants you end up with in your garden or grow room will likely show a wide variety of phenotypic variation. Despite being sold as the same strain, some plants might grow large with wide internodes, while others grow smaller and bushier. The colours on the plants’ foliage might vary slightly, as well as the size and shape of their leaves and the smell and taste of the flowers they produce.
This is because most cannabis seeds on the market today are F1 poly hybrids: the first generation of seeds produced as a result of crossing two unstabilised hybrids. Unlike corn, wheat, or pretty much any other agricultural crop, cannabis hasn’t yet been subject to the strict breeding techniques that help breeders stabilise different plant varieties.
While this means that cannabis seeds can sometimes produce unexpected results, it also opens up a lot of possibilities by giving growers and breeders the opportunity to work with plants with a wide variety of possible traits.
If you’re growing from seed, we recommend taking cuttings from each of your plants once they’re about 2–3 weeks into their vegetative phase. Wait for the cuttings to root and give them at least two weeks of vegging time before you bring them to flower (all while keeping your seed-grown originals in vegetation). This gives you the opportunity to evaluate each plant’s vegetative growth, cloning potential, and flower development. Here are a few things to look for when choosing a mother plant from seed:
Because mother plants are kept in constant vegetation, you’ll want to ensure they have access to nitrogen and other vegging micronutrients. Ideally, we recommend feeding mother plants with organic fertilisers (like vermicompost or compost teas) to promote healthy microbial life in the soil, which in turn will help clean the plant’s medium and prevent salt buildup in the root zone.
You can feed your mother plant like you would any normal vegging plant. Some growers, however, opt to feed their mothers specific fertilisers that contain a milder concentration of nutrients.
Maintaining a plant in vegetation for months (or even years) takes some work on behalf of the grower. Without proper care, mother plants can develop nutrient deficiencies, root problems, or grow to unmanageable sizes. Here’s how to keep a mother plant healthy and happy so it produces the best clones.
Topping is essential for managing the size of your mother plants. Top your mothers early on, roughly two weeks into their vegetative phase. As its new branches grow up towards the light, use pinching and LST to bring them down towards the soil and create an even canopy. Continue topping the plant regularly to train it to grow within the confines of your grow room/tent.
One of the big challenges of keeping mother plants is that they stay potted for prolonged periods of time. Plants that are left in pots for too long can develop root rot and become rootbound, which can then lead to nutrient deficiencies, stunted growth, and problems with pests and plagues.
To keep your mother plant’s roots healthy, grow her in a fabric pot that will trim her roots naturally. These pots cauterise apically dominant root shoots with a thin film of air as they search their way through the growing medium. This prevents the roots from reaching the edge of the pot, and thus allows for more weeks in a single pot—rather than root-trimming once a month or so, as with regular pots.
Every time you prune your mother plant, flip her upside down to inspect her root zone. If a plant’s roots have started growing around the outside of its medium in the shape of the pot, you’ll need to trim them with a clean pair of garden shears or scissors. Ideally, we recommend trimming a plant's roots back to ½ of their original size. Repot the plant, fill up the pot with extra soil if need be, and water well.
While it might seem counterintuitive, trimming a mother plant’s roots is a vital step in keeping the plant healthy and protecting it against root problems while it stays potted for months or years.
Mother plants need to be kept in the vegetative phase of growth indefinitely. This means they need to receive more than 12 hours of light every 24 hours. If they are in a vegetation chamber, they will be getting the standard 18/6 day/night vegetation cycle. If they are in a space of their own and you want to slow growth rates, a 14/10 day/night cycle will keep them in vegetation but growing slower. If you want more clones as quickly as possible, keep up the 18/6 schedule for rapid growth.
Using a metal halide lamp to take advantage of the blue spectrum of light promotes ideal vegetation. Alternatively, consider full-spectrum LEDs.
You can start taking clones from a healthy mother plant roughly two weeks into its vegetative cycle. While the plant is young, we recommend only taking 2–3 clones at a time. As the plant grows larger, you can gradually start taking more cuttings from it every time.
After being pruned, we recommend giving your mother plant at least two weeks to recover before taking more cuttings. Taking too many clones at once or not giving your mother enough time to recover can stress the plant, stunting its growth and making it more vulnerable to pests and plagues.
With a healthy mother and proper cloning protocol in place, you can manage to achieve multiple harvests of top-shelf bud per year. This practice, known as the perpetual harvest method, is all about properly timing your cloning and harvesting processes so your new clones are ready to flower as soon as your old ones have been harvested.