yea thats a new one on me also, i didnt think a root bound plant would cause stretching..
care to expand on that post brick top?
What is Stretch and How Can I Minimize It?
Based on an original FAQ which appeared on the old Overgrow site
Edited and updated by Babygro 2007
Stretch is a term for the natural vertical growth spurt in early flowering. Marijuana will grow in height throughout its flowering phase, but the first 2 weeks of flowering will show the most dramatic change in height and internodal distance. Stretch can also occur in the seedling and vegetative phase. The degree of stretch is determined by the distace between the nodes. The further the nodes are apart, the greater the stretch.
You can transplants stretched seedling and bury the stems in the soil. Some will require support to keep them standing
Stretch is generally considered an unavoidable evil, but some gardeners prefer a bit of stretch to allow budsites to fill in adequately. Buds with perfect density can be grown by controlling stretch.
Encouraging stretch can be a good technique to prevent budrot in susceptible strains and massive colas. Elongated buds are less dense, and the humidity within buds is reduced.
Note: Males will typically stretch much more than females and are easily identified and pre-sexxed by their extra height.
Rootbound plants will also stretch.
Transplanting marijuana plants
Root-bound:
Root-bound is where the roots of your plant outgrow the container they are contained in.
The following symptoms may be observed if you allow your plants to become root-bound:
- Stunted Growth.
- Stretching.
- Smaller and slower bud production.
- Needs watering too often.
- Easy to burn with low % nutrient solution mixtures.
- Wilting.
Root Problems
Root Bound - Root bound is where the roots of your plant outgrow the container they are potted in. Plants that are root bound exhibit stunted growth,
stretching, smaller and slower bud production, easier to burn with nutrient solution, needs watering too often, and wilting. A root bound plant will always start yellowing with the bottom leaves and work its way up the plant until all the fan leaves are gone.
Solution -
To fix this problem you need to transplant your plant into a bigger pot. The 'rule of thumb' with soil is 1 gallon of soil for every foot of growth except for clones which can use a smaller size. So a 2' tall plant is going to need AT LEAST a 2 gallon container. First thing you need to do is gently remove your plant from its smaller container. While its out, inspect its roots, if the roots run in a tight circle around the outside of the root ball, you caught it just in time. Very carefully use your fingers to dig into the outside 1/2" of these circular roots, loosen them up and pull them gently (yes, I said gently ) outward. If the roots are extremely tight, you can VERY carefully slice a thin layer (less then a ½") off the outside of the entire root-ball. Once you have tended to the roots Its time to replant it. Set the now un-bound root-ball into its new larger pot.**Note- Do not pack down this new soil, you want the soil to be settled (with no air pockets) but loose enough to allow the roots to easily penetrate it.
You can read it here:
http://books.google.com/books?id=rnwwxoOb3gUC&pg=PA274&lpg=PA274&dq=why+root-bound+plants+stretch&source=bl&ots=6hWOm_ICdn&sig=KHtP-DrLN60q4gTH5Xchr7jcKjQ&hl=en&ei=mRXdTN-GBYKclgeVkazLDQ&sa=X&oi=book_result&ct=result&resnum=2&ved=0CBkQ6AEwATgK#v=onepage&q=why root-bound plants stretch&f=false
Some of what is said sounds contradictory because it will say stunted growth and then stretching. Overall height will not shoot way up but the nodal spacing will be wider apart, branches will be farther apart and there will be fewer of them in relation to the overall height of the plant in relation to plants grown in larger pots with more room for roots to push out into more soil.