Soil mix for container roses
kentstar
14 years ago
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rosesnpots
14 years agokentstar
14 years agoRelated Discussions
Good garden soil makes poor soil for roses in containers?
Comments (42)The reason you can't trust the volume of nursery pots, Jim, is that those black nursery containers are all "nominal" sizes. That means the volume of the pots is vaguely related to the stated gallon size. A "5 galllon" nursery can is 10.5 in. diameter and 12 in. tall. My online calculator says that is only 3.75 gallons if you pot 2 inches from the top of the pot. That isn't large enough for any rose past the first year or so if it puts on vigorous growth. The foot stomping is an old landscaper practice. It's just a cheap way of determining settlement without taking the time to water a plant in. I wouldn't do it. Water your plant in to settle the soil. I've seen people planting roses into dry potting soil. I wouldn't do it. Many potting soils have peat moss which sheds water once dry. Those of you in climates with steady rain year round may not have this problem, but in the desert West, once peat dries out, it takes a concerted effort to dampen it. I open the bag of soil, stick the hose in, fill it up and mix. Then I pot with dripping wet potting soil and also water it in. It's mud pies for grownups. It assures that the soil comes to the optimal height in the pot (about 2 inches down) and fills major air pockets. I unpot roses all the time and have never found an air pocket. I don't drop pots on purpose. Our summers are too hot to grow a lot of roses in pots well. We can't keep the roots cool enough through June and July. I overpot extensively. A 3 x 3 rose goes in an ornamental pot that is 22-24 inches high. I use various decorative pots from the big box store and always buy the biggest size. Why? They bring to rose up to height and look more in scale with a landscape. It's funny how a pot looks big in a store and miniature in the garden. Also, with those big pots I'm approaching the 15 gallon actual size I find any healthy rose needs. I do a seat of the pants volume-of-cone calculation to guesstimate the volume of the pot, taking into consideration the potting soil is probably 3 inches from the top of the container. Here's a nice online volumetric calculator. http://www.online-calculators.co.uk/volumetric/conevolume.php...See MorePotting soil mix for Roses in Containers?
Comments (2)Any potting mix will usually work, but it is important to remember peat and compost does not last more than one, perhaps two seasons. By then it will be too disintegrated and doesn't hold on to water and nutrients very well. It looses its' structure and can become very dense. Something odd happens when I use peat based stuff more than one or two seasons, it gets too compact and I've had weird issues with nutrient absorption in the plant. The ideal soil for roses in containers is debatable, but will usually contain varying parts of garden compost (leaves, bark, canes, wood chips etc.) sand, a bit of clay, perhaps some peat, composted cow/horse manure (I swear by it), seaweed meal... The idea is to get a good texture which drains, breaths, yet still holds water and nutrients well. With very large containers in which you cannot replace the soil every year it's a good idea to use more sand than you otherwise would do, and a bit of clay. Well composted garden waste (bark, wood chips, cut offs...) work fine as a base, and you can use some peat if you need too (holds water). If there is enough sand, and watering is not a problem, you can get by with replacing the top layer with new compost once a year, and adding some type of longterm fertilizer. It might sound very fuzzy, but if you start with a bag of potting mix you can easily blend in more sand, dry clay powder, and some kind of fertilizer. If the potting mix has a reasonable ph (around 6) you don't have think much about it, but if you make your own from scratch and use pure peat, add enough lime (source of calsium) to get the right ph. A lot of clay can result in higher ph, it depens on the type. If you easily can replace the soil every year you are lucky and usually any good potting mix will do. If you have trouble with containers drying up too quickly, you can add water crystals (the filling in diapers). Roses grown with organic fertilizer tend to live longer in areas with frosty winters, especially compared to roses who get water-soluble stuff like miracle grow. This post was edited by taoseeker on Wed, May 29, 13 at 19:00...See MoreSoil temps of containers with Soil, Perlite and Gritty Mix
Comments (21)Those temps are bad kms2! I have noticed some of my trees in black pots and gritty mix feel like they are baking! Yes, Plumerias grow in the tropics and it's hot BUT they are in the ground. Their roots are cool. Their heads can take full sun all day long but they like their roots cool. Also in most of the tropics there are breezes that help to keep leaf and temps down. I have grown them both ways for years, there isn't a doubt in my mind, they do better planted in the ground. However, let me say this... if they are young, small trees or rooted cuttings, I suggest leaving them in pots until they get bigger and have a well developed root system if you have to move them inside in the winter. In.South Florida or the Keys, put them in the ground and leave them alone and watch them take off. I have a Lutea that was being a real pain. It's a tall and skinny ugly stick that was that way when it was sent to me and it has never bloomed. After I took it out of the ground last October and wintered it in a pot in the garage, this spring I could not get it to do anything. No claws, then claws, claws would shrivel up. I repotted it in gritty along with all the others. couple of months later, still no leaves. I took it out of the mix, a couple 1" tiny brown roots. I was over it. I stuck it in the ground by some that are in pots and told it to root or die, I didn't care which it did. It sat there doing nothing for a couple of weeks and I waited to see if it rotted. Suddenly it took off, leaves all over the place, which means it also is rooting. I gave it some Root Excelerator to help the roots keep growing. No heat mat needed, The ground provides heat without the stress of wild temp swings which occur in pots. I believe bigger trees need to be in the ground and do far better by planting them in the spring, lifting them in the fall if you must due to freezes. Put them in a pot with the soil they were in while planted, put them in garage, greenhouse, whatever you use and leave them alone until spring. On warm days you can mist or give a cup or so of water, but keep them dry. Each year they will get much bigger than they would in pots. I have white plastic trash bags around some of mine in pots that get morning to early afternoon sun at a brutal angle. The heat of those black pots filled with gritty is insane down here in FL. The white bags reflect the heat and make a huge difference! We have had so much rain, day after day, LOTS of rain. I have about 100 in Al's mix and have yet to have 1 rot. In fact I have never seen such explosive root growth and such healthy roots on potted plumies. They are coming out of the bottom, all over the top, even ones that were just rooted in April have filled 1 gallon pots and are read to move up. Roots seem to love the gritty mix but you do need to get those temps down on the pots or the roots near the pots outer sides fry and turn brown. It's easy to test this. Put one where it gets sun, don't turn it. Take it out in a couple of weeks and check. All the roots on the inside that faces the sun will be in bad shape, the ones on the backside, perfect. Once I discovered this I moved most of them so the angle of the sun wasn't as bad, the others that get that intense angle from 9 Am to 2 pm I wrapped with white plastic to reflect the heat. It works,leave the bags loose so the black pot doesn't show through if the bags are thin. My trees look great, growing well, not many blooms yet. They are recuperating from the moves and repots I imagine. I may get mostly roots and growth this year but that's ok. With healthy plants and a big healthy root system, the booms will come in time. My Kapalua has an inflo. Hopefully all this rain won't cause the buds to drop off....See MoreGrow roses in containers, and need advice for soil
Comments (44)This seems like the perfect thread for information about roses and 511 mix. I decided to put all my roses in 20in x 20in air pots with 511 mix. All of them were bare root. So far, it hasn't been great. the bareroots have taken more time than usual to start growing. They also show signs of needing more water. My mix seems to be water repellent and I have had to start watering earlier this year in order to keep the roses from dying off. After a couple of rains and waterings, the pots seem to be holding onto water a little better, and my roses are starting to wake up. But I can still tell the soil is dry when I stick my finger in the top of it. I guess that means it's draining well, but it's not retaining water. This made me worry about summer. So I decided to take some smaller 5gallon air pots and double the peat moss in the recipe to 512. It still drained really fast, but I don't know if that is better for the larger pots or not. So I took another pot and increased the mix to 513. After filling it with water, it behaved much more like the potting mix I normally use (miracle gro potting mix). This morning, I could tell it was retaining water. We had an 80 degree full sun day today, so I'm going to see how it handled it when I get home from work. Thought I'd share this for others who might be interested in this. Everyone's experience has already been very helpful!...See Morejoebar
14 years ago
jim1961 / Central Pennsylvania / Zone 6
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14 years agojim1961 / Central Pennsylvania / Zone 6
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