本文发表在 rolia.net 枫下论坛Wintering Over Bougainvillea Indoors
For bougainvillea in pots, they can be wintered over in basements, garages, or other cool and lower light areas. Under these conditions they go into a dormancy state and defoliate. Occasional watering during dormancy (once or twice a month) is needed until they start to grow again in the Spring where they once again need to be moved into high light. The other option is not to force them into a dormancy state, and place them indoors on a sunny south facing windowsill. You will have to water them more frequently – about as often as a houseplant – and they probably will not have any color. You may see a bract or two sporadically appear, but more likely than not, it will look like a common green houseplant until spring when you can place it outdoors into high light.

If you have planted your bougainvillea in the soil outdoors and want to dig it up and move it indoors for the winter, expect the plant to go into dormancy sooner than if it had been in a container — the root damage as a result of digging will be the cause rather than the cool weather — but the plant should survive this kind of transplanting. Make sure to dig as far away from the root system as you possibly can. It’s important not to sever the roots; take care to dig up the entire root ball and especially in one piece.

For both options, after you bring it back outdoors in the Spring, prune back any dead or damaged stems, and begin watering and fertilizing again. Gradually increase light levels by placing in partial shade for the first few days and working up to direct sunlight by the second week.更多精彩文章及讨论，请光临枫下论坛 rolia.net