seed to flower

The seed-flower life cycle

Humans have many reasons to grow plants. We use them for food, for building materials, for pleasure and for many other purposes. A plant really just has one reason to grow – to reproduce and make more plants like it! A life cycle shows how living things grow, change and reproduce themselves. Many plant life cycles include seeds. This article describes the life cycle of flowering plants.

Flowering plants grow from seeds

Flowering plants produce seeds that are then dispersed from their parent. When a seed comes to rest in an appropriate place with conditions suitable to its germination, it breaks open. The embryo inside the seed starts to grow into a seedling. Roots grow down to anchor the plant in the ground. Roots also take up water and nutrients and store food. A shoot grows skywards and develops into a stem that carries water and nutrients from the roots to the rest of the plant. The stem also supports leaves so they can collect sunlight. Leaves capture sunlight to make energy for the plant through the process of photosynthesis.

Adult plants produce flowers

When the seedling matures into an adult plant and is ready to reproduce, it develops flowers. Flowers are special structures involved in sexual reproduction, which involves both pollination and fertilisation,


Pollination is the process by which pollen is carried (by wind or animals such as insects or birds) from the male part of a flower (the anther) to the female part (the stigma) of another or the same flower. The pollen then moves from the stigma to the female ovules.


Pollen has male gametes containing half the normal chromosomes for that plant. After pollination, these gametes move to the ovule, where they combine with female gametes, which also contain half the quota of chromosomes. This process is called fertilisation. After fertilisation, the combined cell grows into an embryo inside a seed. The embryo is a tiny plant that has root, stem and leaf parts ready to grow into a new plant when conditions are right.

Length of life cycle

Flowering plants all go through the same stages of a life cycle, but the length of time they take varies widely between species. Some plants go though their complete cycle in a few weeks – others take many years.

Annuals are plants that grow from a seed. They flower, make new seeds and then die – all in less than a year. Some go through this cycle more than once in a year. Corn, beans, zinnia and marigolds are examples of annuals.

Biennials are plants that take 2 years to go through their life cycle. They grow from a seed and then rest over winter. In spring, they produce flowers, set seeds and die. New plants grow from the seeds. For example, parsley is a biennial.

Perennials are plants that live for 3 or more years. Some, such as trees, flower and set seeds every year for many years. Other types of perennials have stems and leaves that die away over winter, but the plant continues to live underground. In the spring, new stems grow, which later bear flowers. Tulips and daffodils are examples of this type of perennial.

Nature of science

Scientists often use curious terms. Sometimes the terms relate to their Greek or Latin origins. The English word ‘gamete’ refers to a reproductive cell that unites with another to form a new organism. In Greek, it is similar to the words ‘wife’, ‘husband’ and ‘to marry’.

Humans have many reasons to grow plants. We use them for food, for building materials, for pleasure and for many other purposes. A plant really just has one reason to grow – to reproduce and make more plants like it! A life cycle shows how living things grow, change and reproduce themselves. Many plant life cycles include seeds. This article describes the life cycle of flowering plants.

How To Grow Cannabis From Seed Under 12-12 Lighting

Force flowering marijuana from seed can provide excellent quality, resinous flowers, all the while saving space, time, and money. For those with space constraints, it is a win-win!


Do you want to go from seed to bud quicker and cheaper? A faster, space saving and economical way to grow is the no veg, seed to flower, 12-12 light cycle method.

Growing with a 12-12 photoperiod is a solution to space and resource problems. This method eliminates the vegetation phase of growth and forces the plant to go straight into flower from a seedling. Yields are lower than that of a regularly grown cannabis plant, but results are obtained much faster, with a few advantages.

The 12-12 lighting technique makes the grow cycle 7-9 weeks in general, rather than the much longer time needed when giving plants a vegetative phase. For the space constrained, and those willing to experiment and give it ago, it can be a dream come true.

WHAT IS 12-12?

12-12 simply refers to the hours of light and darkness a cannabis plant is exposed to – 12 of each. Normally, a cannabis plant is exposed to an 18-6 light cycle. This tells the cannabis plant conditions are good for growth, and it focuses on building up size and foliage. When light cycle is changed to 12-12 (either naturally or through human intervention), it tells the cannabis the seasons are changing, and it is time to flower. By forcing a 12-12 light period from the start, the cannabis plant goes directly into flowering, in a bid to reproduce. You are essentially tricking the plant into thinking the growing season is coming to an end, so it needs to produce flowers ASAP.


Growing 12-12 is as simple as changing the timing on your light cycles, giving your plants equal amounts of day and night right from when they sprout. The plants will look different to a cannabis plant that goes through vegetative growth. Photosensitive hormones in cannabis make the highest point the largest cola. This method all but guarantees only main bud growth on every small plant. Essentially you will be growing a cola with a few short, budded side branches – with the plant basically being a bud in itself. Be sure to stake your plants.

Everything to which you would pay attention in a normal grow remains unchanged and are still just as important. pH and water quality, nutrient mixing, pest control, grow medium conditions, EC and ppm all still play their major roles in the dankness and weight of your finished product.

Growing this way still requires all the knowledge that would be needed to flower plants with any other method, and maintenance routines still remain unchanged. After diluted nutrients, while still young, treat your plants as you would during a normal bud cycle. However, flush more often, every ten days at most, so as to avoid salt build-up in the smaller pots.

Done with expert practice and a willing strain of cannabis seeds, it is not unknown to produce 1 gram of ganja per watt of lighting. That’s an impressive 250g in 7-9 weeks for a 250W light in a small cupboard!


  • Lights have full penetration to the floor. Keep an eye on the soil wetness as lights will dry the medium quicker than if protected by a canopy
  • This method is fast. 7-9 weeks on average
  • Less drama trimming as there are far less sugar leaves to deal with
  • Plants are easier to handle for maintenance
  • Can grow in tiny areas
  • Save wear and tear on moving components
  • Save money


Plants with less side branching and canopy spread need less space between them, increasing efficiency. As an example: 1x 15-litre pot produces one plant with a large volume and difficult maintenance issues in a cramped space. 4x 3.5-litre pots in the same sized space can produce just as much dried material with the benefit of being easier to rotate, so the whole plant gets 360-degree light. The entire crop is less hassle during maintenance as each plant is 100% accessible and physically easier to move about. There is no need for a separate sprouting and veg space or time wasted on 18-6 vegetation. The seeds can be sprouted under the 12-12 growing lights providing continual flowering plants.


There is a lesser demand for resources across the boards.

You will experience only half the water consumption with less moisture loss due to evaporation, and a third less nutrients are used. CO₂ and electricity use including most peripherals are reduced by a staggering 650 grow hours annually.

Taking hours to accomplish, tipping, fimming, branch control, and mainlining are now unnecessary freeing up your most precious resource, time.


Always be sure to re-sterilize your grow space after each crop.

Keep a keen eye out for moulds and mildews as the grow space will be getting less light with more moulding opportunity in warm dark corners and creases.


There are some haters of this method, but many love it. Those who hate on it often have not actually tried it. It is all about giving it a go and seeing what works for you. Even if you decide against it after trying it, it all helps expand your knowledge as a grower.

Some sativas will still stretch to 1.2 metres using this method, so species selection right at the very start is key. Indicas are the obvious choice for maximum space saving. They are generally smaller, and 12-12 will keep them very manageable. You will enjoy small pots full of colas, like a miniature stinky forest. Buds grown this way are indistinguishable from vegetated plants in flavour and effects, and at the end of the day, getting buds in the jar quicker and more often is a good thing right?

How to force cannabis to flower from seed for quick, resinous yields using a 12-12 light cycle.