5 Reasons Why Your Calla Lily Is Not Growing

Calla lilies are a favorite among plant people for their elegant blooms and lush foliage. But when these beauties don't seem to be growing, it can be a bit of a head-scratcher. If you've been nurturing your calla lily only to find it's not thriving, you're not alone.

This post will cover five common reasons why your calla lily might be struggling and provide practical tips to help you get it back on track. From watering issues to lighting conditions, we've got you covered with insights that can help you become a more confident plant parent.

1. Incorrect Lighting Conditions

Lighting is one of the most critical factors for any plant, and calla lilies are no exception. These plants thrive in bright, indirect light. If they're not getting the right amount of light, they might not grow as well as they should.

So, what does bright, indirect light mean? Imagine a room where sunlight streams through a window, filling the space with light but not directly hitting the plant. That's the sweet spot for calla lilies. They need plenty of light to photosynthesize and grow, but too much direct sunlight can scorch their leaves.

If your calla lily is positioned in a dim corner, it might be time to move it closer to a light source. On the flip side, if it's in a window with intense sunlight, consider pulling it back a bit or using a sheer curtain to diffuse the light. Remember that light changes with the seasons, so be prepared to adjust your plant's position as needed.

Interestingly enough, artificial lights can also be a great option if natural light is limited in your home. LED grow lights can provide the necessary spectrum of light that mimics natural sunlight. Just place the light about a foot above the plant and keep it on for about 12 to 14 hours a day.

2. Overwatering or Underwatering

Watering is often where many new plant parents go wrong. Calla lilies like their soil to be consistently moist but not waterlogged. Overwatering can lead to root rot, while underwatering can cause the plant to dry out and stop growing.

How do you find the right balance? Start by checking the top inch of the soil. If it feels dry, it's time to water. If it's still moist, hold off for a day or two. It's a bit like baking a cake—you want the soil to be like a sponge cake, not soggy or crumbly.

Another tip is to ensure your pot has good drainage. A pot with drainage holes allows excess water to leave the soil, reducing the risk of root rot. If your pot doesn't have holes, consider drilling some or using a different pot for your calla lily.

Some people find it helpful to set a watering schedule. However, remember that factors like temperature and humidity can affect how quickly the soil dries out, so always check the soil before watering. It might be beneficial to invest in a moisture meter to take the guesswork out of watering.

3. Poor Soil Quality

The soil you use is like the foundation of a house. For calla lilies, well-draining soil is vital. They prefer slightly acidic to neutral pH, and the soil should retain moisture without becoming waterlogged.

If your calla lily isn't growing, it might be time to check the soil. Is it compacted or full of clay? This can restrict root growth and hold too much water. Consider repotting your plant with a mix that's designed for houseplants, or create your own blend using equal parts potting soil, peat moss, and perlite.

Adding organic matter like compost can also improve soil structure and provide nutrients. Just be cautious not to over-fertilize, as too much can harm your plant. A balanced, water-soluble fertilizer used sparingly during the growing season can give your calla lily a gentle boost.

Repotting might sound intimidating, but it's often necessary for the health of your plant. Gently remove the plant from its current pot, shake off excess soil, and check the roots. If they seem crowded, move your calla lily to a pot that's one size larger to give it room to grow.

4. Temperature and Humidity Issues

Temperature and humidity are often overlooked but can significantly affect your calla lily's growth. These plants prefer temperatures between 60 and 75 degrees Fahrenheit. If the temperature drops too low or rises too high, it can stress the plant and hinder growth.

Calla lilies also enjoy moderate humidity levels. If the air in your home is too dry, especially in winter, it can cause the plant's leaves to brown and curl. A simple solution is to place a tray of water near the plant or invest in a small humidifier to maintain ideal conditions.

Another tip is to keep your plant away from drafts or direct heat sources like radiators. These can cause sudden temperature changes that are not ideal for your calla lily. Consistency is key, so try to maintain a stable environment for your plant.

On the other hand, if your home tends to be on the cooler side, consider using a heat mat to keep the roots warm. These mats are designed for seed starting but can also benefit houseplants by providing consistent warmth to the root zone.

5. Pests and Diseases

Sometimes, the issue isn't with the care you're providing but with unwelcome visitors. Common pests like aphids, spider mites, and mealybugs can affect calla lilies, sucking sap and weakening the plant.

If you notice tiny bugs on your plant or sticky residue on the leaves, it's time to take action. A gentle solution of water and dish soap can help wash away pests. Alternatively, neem oil is a natural insecticide that's safe for indoor plants. Just make sure to follow the instructions carefully.

Fungal diseases can also be a problem, especially if the plant is overwatered or in a poorly-ventilated area. Signs include yellowing leaves, black spots, or a fuzzy white growth. Improving air circulation and reducing humidity can help prevent these issues.

For a more hands-on approach, regularly inspect your plants for signs of trouble. Catching problems early makes them easier to manage and helps keep your calla lily healthy. And don't worry if you find pests—it's a common issue and part of the journey of being a plant parent.

6. Nutrient Deficiency

Just like us, plants need a balanced diet to grow. If your calla lily isn't getting the right nutrients, it might not reach its full potential. Yellowing leaves or stunted growth could be signs of nutrient deficiency.

Calla lilies benefit from regular feeding during the growing season. A balanced fertilizer with equal parts nitrogen, phosphorus, and potassium can support healthy growth. You can use a liquid fertilizer every 4-6 weeks, but always follow the recommended dosage on the package.

Too much fertilizer can be harmful, leading to salt buildup in the soil. If you suspect this is the case, flush the soil with water to remove excess salts. This involves watering the plant thoroughly and letting the water drain out completely.

Organic options like compost tea or fish emulsion can also provide nutrients without the risk of over-fertilizing. These natural fertilizers release nutrients slowly, which can be gentler on your plant.

7. Root Bound Issues

Calla lilies can become root-bound if they're in the same pot for too long. This means the roots have filled the pot and have nowhere else to go, which can stunt the plant's growth.

If your calla lily seems to be outgrowing its pot, it might be time for a new home. Gently remove the plant from its pot and check if the roots are circling the bottom. If they are, it's time to repot.

Choose a pot that's one size larger, and fill it with fresh potting soil. When repotting, try to loosen the roots slightly to encourage them to spread out in their new space. This gives your calla lily room to grow and access to fresh nutrients.

Repotting can be stressful for plants, so be gentle and water the plant well afterwards. This helps settle the soil and provides the plant with the moisture it needs to recover and continue growing.

8. Dormancy Period

Calla lilies have a natural dormancy period when they stop growing. This usually happens in the winter months, and it's perfectly normal. During dormancy, the plant conserves energy, focusing on root development rather than above-ground growth.

If your calla lily seems to have stalled, check the season. If it's winter, your plant might just be taking a break. You can help it by reducing watering and stopping fertilization until the growing season resumes.

Once the weather warms up and the days get longer, your calla lily should start to grow again. Give it a little time, and don't be too quick to make changes during this period.

Observing your plant's natural rhythm can help you provide better care and understand its needs. Each plant is unique, and learning to recognize these cycles is part of the joy of being a plant parent.

9. Stress from Environmental Changes

Sometimes, environmental changes can stress your calla lily, causing it to stop growing. This can happen if you've recently moved the plant, changed its location, or had significant shifts in temperature or humidity.

Plants are sensitive to their surroundings, and sudden changes can cause stress. If your calla lily seems to be struggling, think about any recent changes and try to provide a stable environment.

Gradual acclimatization can help reduce stress. When moving a plant to a new location, do it in stages, allowing the plant to adjust to the new conditions. This can make the transition smoother and less stressful for your calla lily.

Patience is key when dealing with plant stress. Sometimes all your plant needs is a little time to adapt to its new surroundings.

Final Thoughts

There are several reasons why your calla lily might not be growing as expected. By understanding the potential causes, from lighting and watering issues to pest problems and root constraints, you can provide the care your plant needs to thrive. Remember, a little attention and adjustment can make all the difference in helping your calla lily flourish.

At Cafe Planta, we're here to support your plant journey. We offer a variety of houseplants and accessories, along with plant-themed apparel for all plant lovers. If you ever have questions about plant care, don't hesitate to email us or send us a message on Instagram. We believe in the power of plants to bring people together and inspire us all.