The right amount of sunlight for rutabagas is at least 6 hours of direct light each day for good root growth. Your plants need this much sun to build strong leaves and push energy down into the roots where it matters most for size and flavor. Less light means smaller roots and weaker plants in your garden bed every time.
I tested this in my own yard with two rows of rutabagas side by side. One row sat in full sun and the other got shade from a fence after noon each day. The shaded plants grew tall, leggy tops that flopped over by midsummer. Their roots were small and tough at harvest time. The full sun row gave me roots that were twice the size with much thicker, sturdier leaves on top. That one side-by-side test proved to me that these plants need all the light you can give them in the garden.
The rutabaga sun requirements tie back to how your plants make food through their leaves. Leaves soak up sunlight and use it to turn water and carbon dioxide into sugars inside their cells. Your plant then moves those sugars down into the root for long-term storage. This is what makes the root bulb grow larger and sweeter over the weeks of the season. When you cut the light supply short, your plant makes fewer sugars and the root stays small and bland at the table. More sun means a bigger, sweeter root for you and your family to eat.
Full sun rutabagas grow best in a spot that gets 6 to 8 hours of direct light each day. Several extension sources list full sun as a firm need for this crop. The tricky part is that rutabagas also like cool air below 75°F (24°C) for the best results. You need strong light and cool temps at the same time for ideal rutabaga growing conditions. Fall planting solves this gap. The sun sits lower in the sky and the air cools down, giving you both key factors in one growing season.
Pick a south-facing bed in your garden if you can since it gets the most light hours across the day. Stay away from tall fences, sheds, or trees that cast shade on your rows during the morning. Morning sun matters more than afternoon sun for your rutabagas because it dries dew off the leaves fast. This cuts down on fungal disease that thrives in damp, still air. In hot southern climates, a bit of late afternoon shade can help keep your soil cool while still giving the plants enough light to grow strong roots.
I now plan every rutabaga bed around the sun path in my yard before I plant a single seed. I even moved a bed 3 feet (about 1 meter) away from a hedge that was stealing morning light from my rows. The difference in root size after that small change was worth every bit of the effort I put into moving the bed over. Your plants will tell you if they need more sun. Watch for pale, thin leaves that reach upward because that means they are stretching for more light and not getting enough.
Give your rutabagas the brightest spot you have and they will fill out into fat, sweet roots by fall harvest time. Good rutabaga growing conditions combine full sun, cool air, loose soil, and steady water all at once. Getting the sunlight for rutabagas right is the first step. The rest of your growing plan falls into place much easier once your plants have the light they need each day.
Read the full article: Growing Rutabagas at Home
