The article discusses a common error made by novice houseplant enthusiasts, which is the neglect of fertilization. It highlights that houseplants quickly deplete the nutrients in the potting soil. Without regular fertilization, plants suffer from nutrient deficiencies, leading to stunted growth and eventual decline. This issue can be addressed by adding liquid nutrients to watering or using slow-release fertilizer sticks placed in the soil once a month.

Expert advice is given by Riikka Kerttula, a gardening advisor from Biolan, who suggests that beginner gardeners use fertilizer sticks for their convenience as the effects last longer and they can use plain water for watering. Furthermore, for those wishing to care for plants in an environmentally friendly manner, the article recommends choosing fertilizers that are suitable for organic production, which can also be used for edible plants.

Ultimately, the article emphasizes the critical role proper fertilization plays in the health of houseplants, urging beginners to be mindful of this essential care step to prevent their plants from entering a survival mode due to nutrient loss. This advice can help cultivate a healthier and more sustainable gardening experience for those new to houseplant care.