Welcome to our guide on whether rusty pots can harm a plant already in the container!

Let's dig in to find out more about this interesting topic.

Rusting and Plant Health

Nicole Sanchez, an Associate Professor of Practice in the Department of Horticulture at Oregon State University, sheds light on the relationship between rust and plant health.

Contrary to common belief, a plant's well-being is seldom impacted by rust on pots. Why? Well, plants require iron as a micronutrient for growth. While an excess of iron can harm plants, the insolubility of iron makes it unlikely for plants to suffer from iron toxicity.

The Role of Rust

Rust, which is iron oxide and not pure iron, is being studied for its potential benefits or drawbacks when used as a fertilizer for iron-deficient plants. However, the iron oxide used in studies is specifically engineered, raising doubts about the effectiveness of iron oxide from rusty pots in nourishing plants.

Sanchez raises concerns about the plant's ability to absorb iron oxide from rusty pots and whether its roots come into contact with the rust, especially if the rust is on the exterior or if the pots has a metal liner inside.

Effect on Existing Plants

Sanchez concludes that rusty pots are unlikely to damage the plants already housed in them, nor is it likely to provide any significant benefits. The minute amounts of iron oxide present are unlikely to significantly impact the plant's health in either direction.

Putting New Plants in Rusty Pots

While there are anecdotal suggestions to include rusty nails in the soil while planting, Sanchez advises against using rusty pots for new plants. While it may not be detrimental, there is no evidence to suggest that it will benefit the plant's growth either.

Dealing with Metal Pots Issues

When plants struggle in metal pots, Sanchez highlights issues beyond visible rust that could affect plant health. Potential problems include a lack of drainage holes, chemicals from finishes, and heat conductivity, all of which can hinder a plant's growth and development.

Tips to Address Rusty Planters

To mitigate potential risks from rusty planters, Sanchez recommends using liner pots with gravel underneath to ensure proper drainage and prevent chemicals or rust from affecting plant roots. Additionally, she shares simple steps to remove rust from metal planters using vinegar or a baking soda and lemon juice paste.

While rusty pots may not be the primary culprit for a plant's decline, it's essential to address other potential issues in metal pots to ensure your plants thrive. Happy gardening, Lykkers!