I'm looking to put some yellow roses in a 2' long planter, and my local garden center doesn't have any yellow roses. Perhaps they are out of season? And I see there are a bunch of different kinds of roses (climbing and bush). I'm wondering what sort of roses would be suitable for planting in a pot, and any recomendations about where to acquire them (website?)
I'm sorry to be the bearer of bad tidings, but 6 inches deep means your trough or container isn't really suitable for roses - even miniature roses need 9-12 inches of soil beneath them. There is some information on growing roses in containers here, where it mentions deep pots as being suitable https://www.rhs.org.uk/advice/profile?PID=278
The other factor to consider is winter - I think you are in USDA zone 6 or 7, but if you regularly get temperatures below 32degf day and night for longer than a week at a time, there is a high risk that the soil in the trough will freeze, and if that happens, roots will freeze too. The risk of that would mean relocating the trough to somewhere its less likely to freeze during winter.
If your winter temperatures do get that low, it might be better to use temporary planting for the summer and early fall, and replant again the following year. If you do want to check out roses, this site http://www.roguevalleyroses.com/content/zone-hardiness-information has a tose selector -you need to click on Advanced Search in the left hand menu and enter information. Even so, the available root depth is still an issue...
Lewis, any rose can be planted in a planter. 6" is fine for roots but not so much for drainage. You need your soil depth to be at least one foot, one and 1/2 feet for stability. Holes in the bottom of the planter, critical.
You have to use just sterilized potting soil in your planter. Critical. The pot and pruning control the size of plants planted in a pot.
I am trying to find the rose group of floriferous shrub or floribundas...that are even better. I'll edit this soon, got to find those roses fairly a newbie type. Haven't found the name I was looking for but 'groundcover' roses would be in this category as well as mini's.
Do not add compost to that sterilized potting soil. Silly. Potting soil needs no help for drainage and compost ain't sterilized. Do not FEED like crazy either. Keep the fertilizer so that the Nitrogen is the lowest in percentage of the 3 macro chemicals. The third thing is 'bigger is better' for pots is wrong. I disagree with these three things in this article.rose container gardening
For pots miniature roses or pot roses are suitable. Usually best time to buy them is early in season (spring).