Your indoor citrus trees have a thing or two to say about your relationship. Don’t take this the wrong way; they appreciate what you do for them. But unless you make some changes, this isn’t going to last.
I’ll admit, putting this resource together for you was a little selfish on my part. I have recently jumped back into the circus that is trying to grow indoor citrus trees while living in a cold-weather climate. Our February 2022 issue of Food Gardening Magazine inspired me because we have created a whole collection on growing oranges. I’ve been down this road before and got sloppy when summer came around, but this time it’ll be different, I’m sure of it!
I bought my latest pair of citrus trees at a local gardening center because shipping is a bit harsh on the plants. The woman in the gardening center said that citrus trees like humidity so much that if given the choice, they’d prefer to be on a cool damp porch or in the basement (above 65 degrees F), than in a warm but dry room. I think that’s a mistake a lot of us make, thinking our citrus trees just want to be warm when what they really want is humidity.
Citrus trees enjoy the sunshine and fresh air, which is why I have always put mine outside in the summer. They enjoy the warm days and the cool rains of summer. But getting your citrus trees to create fruit in the winter takes work all year. Maybe you already know that. And look, your indoor citrus trees really do like you. They want this relationship to work. They love the way you smile when you look at them and hold their leaves in your hand, even when you crush up a lime leaf or two for the intoxicating scent or a recipe. Still, something is usually missing if they’re looking a bit unhappy.
Learn how to keep your indoor citrus trees happy and healthy
I completely understand the desire to have indoor citrus trees. There’s nothing like a little tropical color in your kitchen to brighten up a cold winter day. They smell great, look great, and the fruits are delicious. It also helps that January through March is generally when citrus trees fruit, so you get a little gardening joy in the dark days of winter in your indoor container garden. Citrus, however, are not typically cool weather trees. So if you’re growing indoor citrus trees in cold dry winter, it takes extra love.
There are some exceptions. Satsumas and kumquats can withstand below-freezing temperatures and are a little more tolerant of just about everything. For the most part, however, citrus trees would be happy if they could spend the winter in Florida. Since most of us aren’t going to pack up our Meyer lemon tree and head south for the winter, it’s important to keep some essential care tips in mind.
1. Citrus trees need sunshine. Most require at least 8 hours of sunlight daily. That means your indoor citrus trees need to be near a south-facing window.
2. Citrus trees need warmth. You don’t need to crank your heat to 90, but if you expect your citrus trees to thrive indoors, you’ll need to keep the heat around 65, dropping it by 5 to 10 degrees overnight.
3. Citrus trees need water. Not many surprises here. Moist, but well-drained soil. Maybe even let it dry a bit between waterings. Cactus and succulent mix tend to be a good choice here, they want chunky soil.
4. But not too much. That means not too much water or too much dry. You do not want root rot. Ideally, give your indoor citrus trees a big ole drink of water, let the soil dry out, then repeat. And don’t leave extra water just sitting in the saucer. You can add stones to the bottom of your saucer, which will absorb moisture and add to the humidity surrounding the plant.
5. Not too cold, either. One more water tip – don’t pour icy cold mid-winter tap water into your citrus tree soil. You don’t want a cold shower, and neither does your tree. Use room temperature water; otherwise, you could shock the tree.
6. Use a humidifier. If I haven’t stressed it enough, they love and need humidity, so in the winter you’ll need to keep a humidifier (or two) running in the room you’re keeping your citrus trees. Mine do really well with a warm mist humidifier, the difference was visibly noticeable when I switched. If you don’t have a humidifier, give ’em a spritzer. No, not the kind with wine and club soda. That’s for you. But your citrus will need a daily spritz of water to keep from drying out.
7. Feed the tree. If your indoor citrus trees are actively growing, give them a little nutrient boost with a fertilizer designed specifically for citrus. Citrus trees get fertilized three times per year (winter, late spring, and late summer). See our Collections for guides on fertilizing different types of citrus.
8. Watch for pests. Yeah, citrus trees are susceptible to pests just like any other indoor plant. Scale and aphids are fairly common. However, some homemade insecticidal soap will usually take care of these pests.
9. Be the pollinator. If your tree is indoors year-round, you may need to give it some help with pollination if it’s not self-pollinating. It’s easy, though. Just give the branches a little shake when the flowers are open.
10. Move ’em out. Once warm weather rolls around, try to give you indoor citrus trees some outdoor time. When you have regular temperatures of at least 50 degrees overnight, start giving your citrus time outside, slowly building up to leaving it outdoors. It might take a couple of weeks to do this, but your tree will love you for it and you’ll reap the benefits in the next growing season.
Do you have any indoor citrus trees? What tips would you add to this?