Q&A with Jorge
Small Space Growing
Small growing spaces are difficult to manage. This small space was doing well until the temperature rose in the summer and the grower could not get the ventilation sorted to remove the heat.
Seedlings need less intense light during the first few weeks of growth. If you put the lamps too close to plants, they will not grow any faster. In fact, heat from the T5 fluorescent tubes will probably burn leaves and dry out the soil or growing medium. With only three feet from the ceiling to floor, you have to make sure the plants bloom as soon as possible. Since you planted seedlings, you will have to wait until plants are two months old and show their first pre-flowers before you can induce flowering with a 12/12 day/night light schedule. By this time, plants will be at least a foot tall. Containers will take up at least six inches of the room below. Once flowering is induced, plants will grow another 30-45 cm. So you can see there is little space for plants to grow.
This circulation fan blows above plants to keep the air moving below.
You will have to bend plants so that they will fit in the small space and receive adequate light. Bending plants also diffuses floral hormones (auxins) sending lower branches the signal to make bigger buds. Start bending plants when they grow 4-5 sets of leaves.
Next time, start with female clones. Once they are well rooted and transplanted induce flowering when they are 15-20 cm tall. This way you will have plenty of space for them to flower.
Sixteen plants will soon fill this 4 x 4-foot grow room.