House Plants Grown to Tree Form Miniature Rose Trees. The tree rose seen in outdoor gardens is actually made up of two different varieties-a hardy species for the rootstock, with a hybrid type grafted to it. Miniature roses can be trained into decorative standards without grafting. These make prized pieces for sunny window gardens, greenhouses, or summering out-of-doors. If you have grown the miniature from seed or from a cutting, keep it growing upward as one stem. Pinch out all side growths. At a height of eighteen to twenty inches, remove the growing point and allow the top to develop. It takes about two years to develop miniature rose standards. If you purchase a miniature rose to train, remove all extra canes except the one chosen to be the trunk. Then train the tree as outlined above. Rest the miniature rose standard in a light, 50-degree room from November until February. Water it often enough to make the trunk and branches stay plump. Bring to sunlight and warmth in February. After that, water and fertilize it at least twice a month. Prune carefully to maintain a desirable shape. Red spider mites and aphids may attack. You can download now more about Miniature Rose Trees with Plant Spot. Ornamental Pepper Trees. Plants of Capsicum annuum make delightful standards about eighteen inches tall. Grow them from seeds or cuttings. With judicious pruning they can easily be shaped into balls, squares, or cones. They grow so rapidly that a crop of shining fruit within six months after planting is not unusual. Ornamental peppers summered outdoors in a sunny to semi-shady place set more fruit than those kept inside.