Get your sunglasses, because this is one bright plant!  The Marmalade Bush (Streptosolen jamesonii) is a rare bush that's smothered in cheerful flowers throughout the year.  The inch-long, trumpet-shaped blooms are a riot of colors, ranging from yellow to orange to red.  This hard-to-find ornamental happens to be easy to grow.  Seeds don't germinate well unless fresh, so i offer established plants and freshly picked seeds.

The Marmalade Bush is an evergreen, perennial bush from South America.  It grows about 6 feet across, although you can prune it down to any size you wish.  It has a spreading habit and can be allowed to spill over a wall or hanging planter, or pruned to a neat, upright shape.  Even without blooms it's an attractive plant, with glossy, bright-green foliage that has a ribbed appearance.  The flowers appear almost all year long here in San Francisco, with the largest show from spring through autumn.  The 5-petaled blooms start out yellow or light-orange when they first open, then deepen to a darker-orange and red as they mature.  Butterflies and birds regularly visit the Marmalade Bush!

It comes from the Andes mountain range, where the climate is mild all year.  I have no information on how much heat it can take, but there are scattered reports of it growing in warm climates like Florida and Texas.  I believe it is hardy only to about 28 degrees F (-2 degrees C).  It is easily grown in a pot in well-draining soil.  It likes mostly-sunny conditions, and regular watering & feeding.  Over about 40% humidity seems to be best. 
By the way, in case you're tempted to taste to the "marmalade" flowers, i don't know if they are edible.  Like its cousin, the Brugmansia, it might contain a toxin.

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Germination tips for this plant