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Grow Room Transition Tips: Launching the Ultimate Flowering Phase

Get the best of our your plants with great tips from Rosebud Magazine. Get the best of our your plants with great tips from Rosebud Magazine.


Moving plants from the vegetative stage into flowering is one of the most exciting times for a grower. Once nutrients and light schedules have been adjusted for flower production rather than leaf and stem growth, the beauty of these plants can fully develop.

Flowering is the reproductive stage of the plant’s life; plants flower in an attempt to produce offspring. Hormonal changes leading into procreation cause the plant to grow bigger, stronger and faster once flowering is initiated. So what are your plants trying to do at this phase, and how can you help them grow bigger and faster?

Rooting is one of the first considerations. If you grow strong, healthy vegetative plants, they’ll already have an excellent mass of roots. Most growers transplant into larger containers or hydro systems for the flowering phase, and with good reason. As the plant senses the changed light cycle and a bigger rooting space, more energy is given to root production. This allows the plant to feed more while creating stability for heavy branches down the line.

A boost of phosphorous will encourage an explosion of roots and the initial production of flowers.

You will notice in the first several days of a 12/12 light cycle that plants are getting taller and wider at a hurried pace. The roots will be doing the same thing, growing long and strong in the increased space provided. The production of roots during this transitional phase will determine the flower size. More roots equal more fruits. Use beneficial fungi and bacteria to encourage a massive root zone.

Stem growth will increase as well. Plants will need enough vertical space to triple in size before harvest. You may see a foot or more of vertical growth during this early transition. The plants will bulk up to produce great big blooms.

Plants have the ability to use more phosphorus during the transition. A boost of phosphorous will encourage an explosion of roots and the initial production of flowers. Phosphorus uptake is partially determined by the amount of oxygen available to the roots, and both muddy soil and warm water can reduce available oxygen. On the other hand, highly oxygenated roots will grow faster and flip the plant into flowering more quickly.

While roots want an oxygen-rich environment, the leaves want CO2. Think of it this way: When athletes train, they breathe more heavily. Fast-growing plants react the same way as they begin flowering. Under bright lights, plants can take in increased CO2 to develop a heavy biomass.

Though it may be invisible to the human eye, sunlight has a bit more red during the fall. As a result, plants have evolved to ripen or increase reproduction when blasted with autumn sunlight. In grow rooms, we can choose lights that lean toward the blue spectrum for the best vegetative growth or the red spectrum for big blossoms.

When plants are introduced to red-hued lights at the initiation of a 12/12 light cycle, flowers will develop faster. In years past, growers were encouraged to continue the use of vegetative lamps for the first two weeks of flowering. More recently, this practice has been found to lengthen the time to harvest without any substantial yield increase. In addition to a change in spectrum, more powerful lights should be used in flowering to help speed up the transition and maximize yield.

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Last modified on Monday, 18 March 2013 17:14

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