In this video, we add lime to the soil of a corn plant (Dracaena fragrans), because a pH test in Part I of this video showed that the soil needed to be more alkaline for the corn plant to grow well. This video shows how to add the lime and talks about what to do if you need the soil to be more acidic.
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Hello, and welcome to HealthyHouseplants.com, where we teach you all about indoor gardening! Today, we’re diving into part two of our guide on adjusting soil pH to help your plants grow strong, healthy, and vibrant.
In this video, we’re working with a corn plant that hasn’t been thriving. After verifying proper watering, fertilizing, sunlight, and repotting, I checked the soil’s pH level. This corn plant prefers slightly alkaline soil, but the current soil tested as neutral to slightly acidic. Adjusting soil pH is key when you’ve gone through the basic checklist and still notice your plant struggling. A plant that can’t access nutrients due to pH imbalance may show signs like spotting on leaves.
To adjust the pH to a more alkaline level, lime is our go-to amendment. For acidic soil needs, use soil sulfur. For today, though, we’ll apply lime by creating small holes in the soil and adding lime granules to reach different depths. It’s essential to water well after applying any amendment to ensure it spreads evenly. Adjustments take time, so we’ll check back in a month to see if new, healthy growth emerges.
FAQ
Why is soil pH important for indoor plants?
Soil pH affects nutrient availability to plants. When the pH is too high or low, plants cannot absorb nutrients properly, which can lead to poor growth and leaf discoloration.
How can I tell if my plant’s soil pH is off?
Signs of improper pH include yellowing or spotted leaves and general poor growth despite proper watering, light, and fertilization. A pH test can confirm the level.
What is the best way to make soil more alkaline for houseplants?
To increase alkalinity, use lime. Create small holes in the soil, add the lime, mix it slightly, and then water thoroughly.
How often should I retest soil pH after making adjustments?
Retest your soil pH after about a month. It takes time for amendments like lime to change the soil’s pH effectively.
Can I use sand or vermiculite to improve drainage along with pH adjustments?
While sand can work for certain plants like succulents, it can also compact soil over time. Vermiculite is best for moisture retention rather than drainage.
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