From a plant's perspective, the question of coming inside for the winter is not a matter of preference but one of survival. As an Adenium obesum, my physiology is engineered for heat, sun, and arid conditions. My thick, caudex stem is a water reservoir, and my succulent leaves are designed to minimize moisture loss. When temperatures consistently drop below 50°F (10°C), my cellular processes begin to slow dangerously. A hard frost is a death sentence, as the water stored in my tissues freezes, expands, and ruptures my cell walls, causing irreversible damage. Therefore, if you live in a region where winter brings freezing temperatures, bringing me inside is not just kind—it is essential for my continued life.
The move from the vibrant, fluctuating outdoors to the stable, often dimmer indoors is a significant shock to my system. A sudden transition can cause severe stress, manifesting as leaf drop and a halt in growth. To help me adjust, please begin the process before you turn on your home's heating system. About a week or two before the first predicted frost, move me to a shadier, more sheltered spot on your patio. This first step reduces the light intensity I receive, partially preparing me for lower indoor light levels. Next, perform a thorough inspection of my leaves, stems, and the soil surface for any stowaways—aphids, spider mites, scale, or fungal gnats. A gentle spray of water or an application of insecticidal soap will ensure I enter your home clean and do not introduce pests to your other houseplants.
Once inside, my well-being depends entirely on the environment you provide. My most critical need is intense, direct light. A south-facing window is my best substitute for the desert sun. An east or west window may suffice, but I will likely become leggy, stretching for more light. If such a window is not available, a full-spectrum grow light placed 6-12 inches above me for 12-14 hours a day will keep me photosynthesizing effectively. Regarding temperature, I am comfortable in the same range as you—between 65°F and 85°F (18°C - 29°C). Crucially, keep me away from cold drafts from doors and the direct, dry blast from heating vents, as both can cause stress and leaf loss. The low humidity of a typical heated home is actually suitable for me, as it mimics my native arid environment.
This is perhaps the most counterintuitive part of my care. With less intense light and potentially cooler temperatures, my growth will slow significantly, and I may even enter a semi-dormant or fully dormant state, losing some or all of my leaves. This is a normal, energy-conserving strategy. During this time, my water needs plummet. You must drastically reduce watering. Overwatering is the single greatest threat to my life indoors. Water only when the soil is completely dry, and then provide a very modest amount—just enough to moisten the roots without leaving the soil soggy. In a cool room, this might mean watering only once a month or even less. My plump caudex is my insurance policy; I can draw upon its stored water to survive this dry period.
