Spring arrives with richly fragrant blooms, my favorite being the citrus. Citrus trees uniquely bloom all year, but the rainy season inhibits the scent from traveling very far, if at all. I love bringing my dwarf citrus tree into my greenhouse to enjoy its scent during the winter. While I know a lot about growing and caring for citrus, I didn’t know why our climate was conducive to these varieties. Despite our foggy mornings and cold spells, I see citrus trees heavy with fruit all along River Road. Wouldn’t the trees prefer a hotter, more tropical climate?
Oddly, the answer is no. Watching the Florida orange juice commercials as a kid made me believe all the best citrus was grown there, when citrus actually thrives in a Mediterranean-style climate. The fruit naturally contains both sugars and acids. The warm days of summer allow steady sugar buildup, and cool nights slow the sugar consumption and balance the acidity. This contrast produces ideal conditions for fruit to ripen slowly and develop more complex flavors.
In hot climates, the fruit ripens too quickly, leaving no time to adequately sweeten. The lack of cool nights leads to low-acid and one-dimensional flavor. Conversely, our gloriously cool nights slow down sugar production and help retain acidity, providing that ideal sweet-tart balance. It’s the same reason why our region is famous for wine. There’s an actual science behind balancing sugars and acids, but I was surprised to find it applied to citrus.
Even better, winter coincides with our rainy season, so the fruit receives steady moisture for healthy growth. Most varieties are also cold tolerant, so they can withstand the light frost our area experiences a few times throughout the season.
Another interesting observation is that the skin of my citrus has always been thick and less juicy inside. When I buy citrus, it’s often the opposite: juicy and thin-skinned. I thought I was doing something wrong, but I found out that there’s a reason why they can pop a straw into a Florida orange and drink the juice. The Florida climate provides consistent rainfall and humidity, which keeps the citrus trees evenly hydrated. Our dry summer climate provides less consistency with moisture and leads to drier and thick-skinned fruits. Basically, our climate produces citrus perfect for snacking that will transport well, and Florida produces fruit for juicing.
Now that you know how citrus develops flavor, we will investigate caring for our trees in next month’s article. I find their pests can be challenging to manage (scale!), and their nutrient needs are heavy, so it’s worth taking the time to discuss.
In the meantime, does anyone know where some of the best citrus in the world is grown? If you have a guess, without consulting your friend Google, email me. The first two people to answer correctly will receive a selection of seeds saved from my garden. I’ll announce the answer and the winners in the May issue, where I’ll continue our conversation on citrus. Happy gardening!