yellowing leaves

Not all plant problems are caused by insects or diseases. Sometimes an unhealthy plant is suffering from a nutrient deficiency or even too much of any one nutrient. Plant nutrient deficiencies often manifest as foliage discoloration or distortion.

Eliminate the obvious before you try to make any drastic changes:

• Check first for signs of insects or disease.
• Foliage discoloration and stunted plants can easily be caused by soil that is too wet and drains poorly or soil that is too compacted for good root growth.
• Extreme cold or heat will slow plant growth and effect flowering and fruit set.
• Too much fertilizer can result in salt injury.

Plants require a mix of nutrients to remain healthy. Nutrients that are needed in relatively large amounts are called the macronutrients. Plant macronutrients include: nitrogen, potassium, phosphorus, calcium, sulphur and magnesium.

There are a handful of additional nutrients that are required for plant growth, but in much smaller quantities. These micronutrients include: boron, copper, iron, manganese, molybdenum and zinc.

All of these nutrients are taken in through the roots. Water transfers the nutrients from the soil to the plant roots. So one requirement of sufficient plant nutrition is water.

A second requirement is the appropriate soil pH for the plant being grown. Each plant prefers a specific pH range to be able to access the nutrients in the soil. Some plants are fussier than others, but if the soil pH is too acidic or alkaline, the plant will not be able to take in nutrients no matter how rich your soil may be.