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The Knockout roses and Home Run series of roses will flower nicely even when kept more of a short bush. I prune mine fairly aggressively and they do just fine. I especially like the bloom production I have gotten out of my Double Knockout and my Watercolors Home Run bushes. You can also look at some lower growing floribunda rosebushes that will work and they love to bloom, just check out the growth habit of the ones you like the looks of. If their growth habit states bushy and medium in height maximum you should be okay.

Knockout roses can do quite well in pots. I would not use a pot less than 18 to 20 inches in diameter and at least as deep as a five gallon bucket. I like to give the root system lots of room to spread out. I have some rosebushes and a rose tree planted in some of those rope handled storage buckets or tubs, like found at this link: http://www.agrisupply.com/product.aspx?p=89202&sid=bsf10&eid=Ebsf10&utm_source=bing&utm_medium=cpc&utm_campaign=NB_PLA_AllProducts_BING&zmam=77232640&zmas=1&zmac=2&zmap=89202&utm_content=0CU9k6LK_dc|pcrid|11231445313|pkw||pmt|| I drill holes in the bottom for drainage and put a layer of 3/4" gravel in the bottom to help the overall drainage work well. I place the tubs on a couple pieces of redwood or treated wood, again to allow a free and open drainage area. The tubs are way less costly than some pots. With today's spray paints that work on such plastic materials I can even paint them up with different colored bands or designs to give them a bit of character if I so choose. I use a good amended bagged garden soils mix or potting soil from EKO or Miracle Gro for the planting soils.

You can plant them in containers. Select large pots/containers that have drainage holes in the bottom. The Knock Out roses will do fine in them. I would use a medium color pot though and not a dark to black pot as that could overheat the root zone and cause problems. You could also dig holes in your garden or landscape area and refill the holes with rosebushes in them with a good bagged outdoor planting soil with compost in its mix. Add a cup of alfalfa meal and a cup of kelp meal to the planting soils and mix in well. Then once planted water them in with some water that has both a product called Super Thrive and a root stimulator product mixed into the same soils. Water them with a new batch of this mix the next 4 to 5 times they need watering and they will get going well.

Knockout roses can do quite well in pots. I would not use a pot less than 18 to 20 inches in diameter and at least as deep as a five gallon bucket. I like to give the root system lots of room to spread out. I have some rosebushes and a rose tree planted in some of those rope handled storage buckets or tubs, like found at this link: http://www.agrisupply.com/product.aspx?p=89202&sid=bsf10&eid=Ebsf10&utm_source=bing&utm_medium=cpc&utm_campaign=NB_PLA_AllProducts_BING&zmam=77232640&zmas=1&zmac=2&zmap=89202&utm_content=0CU9k6LK_dc|pcrid|11231445313|pkw||pmt|| I drill holes in the bottom for drainage and put a layer of 3/4" gravel in the bottom to help the overall drainage work well. I place the tubs on a couple pieces of redwood or treated wood, again to allow a free and open drainage area. The tubs are way less costly than some pots. With today's spray paints that work on such plastic materials I can even paint them up with different colored bands or designs to give them a bit of character if I so choose. I use a good amended bagged garden soils mix or potting soil from EKO or Miracle Gro for the planting soils.

Yes it is okay to get some water on the leaves. It is not advisable to leave water standing on the leaves in the hottest times of day, as the droplets act like magnifying glasses and can cause foliage burn. Constantly having water on the foliage over night can help get fungus problems started, so limit the times they are wet so as to allow things to air dry well. Watch for signs of over-watering too such as foliage wilting.

Some fertilizers, like Osmocote, will form little pearl looking things on the roots because that is how the bushes get the nourishment. So that may not be it. I would contact a local Consulting Rosarian in your area and have them come take a look. You can look some up at the American Rose society website. That is the route I would go. I definitely would not do the gasoline thing! I would amend the soils with a good compost prior to replanting though.