Most frequently this is cosmetic damage from overdosing with fertilizer. Give the tips time to thoroughly dry and then carefully clip close to healthy growth with sterile cutters, being sure you don't cut into firm flesh. If the tips do not just dry, you have another problem.

Read your post. Sounds like a classic case of overwatering. I have bamboo in South Texas (zone 10). I started out overwatering as well. Bamboo does not like to be soaked. If you can, dig down a little ways and look at the node (culm lines). You can visibly see a drowning plant. All of the tissue will be mushy and brown around the node. You need to let this dry out to try to get some new growth and root, but do not leave it exposed to air after you view it. Cut back your watering drastically. If you see the leaves start to curl in, then you will know it is too dry and time to water again. As to fertilizer - ABSOLUTELY. Bamboo is a grass and so LOVES a very high nitrogen count fertilizer. You can feed it monthly (or less with a slow release fertilizer). You can buy a very inexpensive grass fertilizer like a 32-0-10 or 29-0-0 at Lowes or Home Depot. Make sure it is NOT a weed and feed variety or you can kill the plant. The Scotts sells for $35 for a 50 lb. bag or $13 for a smaller bag. For my full grown, 5-foot diameter plants, I put a full coffee cup per plant. If your Alphonse Karr plant is new and about a 5 gallon size, I would put 1/4 to 1/2 coffee cup of the fertilizer spread all around the plant, not just directly on the roots, and maybe a little more after you see it start to respond. Water a little to soak it in and then watch the leaves turn brilliant green over the next couple weeks. If you have a high alkaline soil, you can also add a few minerals like Calcium and Magnesium, or just some garden sulpher. That's why I buy the grass fertilizer with added 2% sulpher. If it looks like you are going to lose the plant, I would dig it up and let it recover in a mix of 1 part sand, 1 part peat moss and 1/4 part compost until it starts to shoot again. Remember, it likes full sun 5-6 hours a day. Good luck. Alphonse is a beautiful peach-shooting plant!

The Flora series is a three part system (Grow,Micro,and Bloom ) using all three from seedling on. Their Flora Nova Series is a one part nutrient(7-4-10) Grow alone for the first three weeks then combine with Bloom for a week then just bloom. You need to change your water every 7-10 days GH has a feeding schedule online under resources. With hydroponics you have to follow what ever feeding for the specific manufacture nutrient you are using since they are not all complete or compatible. If you are using coco for your medium cut the number of cycles or mix course perlite 50/50. Also when you say 1-1-1 are you talking NPK or ratio of Flora? This post was edited by randy355 on Mon, Sep 22, 14 at 2:10

Do you take mulitvitamin/multimineral supplements such as One A Day or Centrum Nallah? The minerals used in these two and nearly all supplements are chemically created minerals produced by humans and the exact same minerals used in so called non organic fertilizers for plants. Such as potassium chloride, magnesium oxide, dibasic calcium phosphate and many more. We use the same elemental elements as plants do. and extract them only in their pure form known as chemical elements found in the periodic table of elements, if you remember high school science. Chemically created synthetic fertilizers are simply a combination of two or more organic elements, sometimes using high heat, to extract the pure chemical element plants can take in, along with humans. We can't eat phosphate rock or limestone but we can extract the elements of phosphorus and calcium we can consume, same for plants. Soda drink has phosphoric acid in it along with tooth paste, Phosphoric acid comes from treating organic phosphate containing material with sulfuric acid, Sulfuric acid is a natural organic salt of sulfur and also organic. So where is the danger? The idea that man made chemical fertilizers are dangerous is a myth and this is where the danger is. I say a dangerous myth because without man made synthesized fertilizers over half to three quarters of the world population would starve. Not may but would without a doubt. People who think only organic is fine only if they know the facts and not try to force everyone to do the same. it would take 30 tons of cow manure to fertilize 1 acre of crop land to produce half the yield they do now. 30 tons of cow poo requires about 4 cows. 4 cows require 8 acres of good forage land per year. Removing the manure to fertilize your crop land would then reduce the forage available next year. The next year even less, and so on until your 4 cows starve. If you did the same with alfalfa each year the source land would become depleted, and any organic source would quickly become depleted. The world would starve, and organic vs chemica is a major rant of mine because people don't know how sensitive the world food supply is and could easily collapse with the wrong laws by the wrong people. 2,7 billion acres are used to feed the world population and people are starving now, this doesn't include land used for livestock. 2.7 billion acres would require manure from 11 billion cows to support the land by ORGANIC means, but wouldn't last long. You can use organic fertilizers as a personal choice but please be aware most of the worlds population would die without man made synthetic fertilizers made from natural elements that are perfectly safe.