How to grow aquatic plants in outdoor fish tanks – A simple guide for beginners

Growing aquatic plants in an outdoor fish tank not only creates a more natural and comfortable habitat for your fish but also helps purify the water, reduce harmful algae, and enhance the beauty of your space. In this guide, we’ll walk you through an easy and beginner-friendly way to grow aquatic plants outdoors.

Best aquatic plants for outdoor fish tanks

Best aquatic plants for outdoor fish tanks

Before diving into the planting process, let’s take a look at some of the most popular and visually appealing aquatic plants that thrive in outdoor fish tanks:

Water Orchids

Water orchids are a unique species that can live fully submerged or in semi-aquatic conditions, making them incredibly versatile for aquascaping. When grown in a semi-submerged setting—where the roots remain underwater while the stems and leaves rise above the surface—they flourish and may even bloom. Their delicate white flowers add a subtle yet elegant accent to any outdoor tank or water feature, making water orchids a top pick for those who enjoy natural, minimalist beauty.

Umbrella Papyrus

Umbrella papyrus is a familiar aquatic plant, especially common in Southern Vietnam. It typically grows in the wild around ponds, lakes, and canals and adapts easily to various aquatic environments. With its tall, slender stems and umbrella-like foliage, this plant brings a refreshing, tranquil vibe to any outdoor garden or fish pond. Its resilience and low maintenance needs make it a great choice for beginners looking to grow aquatic plants with minimal effort.

Ludwigia

Ludwigia is among the most popular aquatic plants for outdoor aquariums, loved for its graceful appearance and easy care. Its flowing branches and soft texture create a dynamic underwater landscape, offering natural shelter and play areas for fish. Thanks to its adaptability, Ludwigia is an excellent option for enhancing both the aesthetics and ecological balance of your tank.

Step-by-step guide to planting aquatic plants in an outdoor aquarium

Step-by-step guide to planting aquatic plants in an outdoor aquarium

Here’s a simple yet effective method to help you successfully plant aquatic flora in your outdoor fish tank:

Pre-treatment: Clean the plants before planting

Before introducing any aquatic plants into your tank—especially indoor setups that feature UV lights, coral, or high-value fish—it’s crucial to treat them first. This helps prevent the introduction of pests or parasites. Soak the plants in a mild disinfectant solution, such as diluted potassium permanganate or hydrogen peroxide, for 10–15 minutes. Then, rinse thoroughly with clean water. This quick and easy step protects the health of your fish and the overall tank ecosystem.

Step 1: Clean and prepare the plants

Aquatic plants often come from nurseries or shops and may carry dirt, debris, fertilizer residue, or even hidden pests like snail eggs or small shrimp. If left untreated, these can spread rapidly and disrupt the tank’s balance. Always clean your plants thoroughly before planting.

Step 2: Set up the substrate

Next, prepare the substrate at the bottom of your tank. For smaller tanks or limited space, use a nutrient-rich aquascaping soil or an inert base like small gravel or white sand. Start with a layer of substrate soil, then top it with gravel to keep everything in place while enhancing the tank’s visual appeal.

Step 3: Plant with care

When planting, ensure the roots are securely anchored in the substrate so the plant can absorb nutrients properly. Use aquascaping tweezers or your hands to gently insert the plants without damaging the roots. For small foreground plants like Glossostigma or Helanthium tenellum, group them together to create lush green carpets. For epiphytic plants like Anubias or Java fern, simply tie them to rocks or driftwood and place them in the tank. With regular care, your outdoor fish tank will stay lush, vibrant, and full of life.

We hope this guide has inspired you to start growing aquatic plants in your outdoor fish tank. With the right setup and a little patience, you’ll enjoy a thriving, beautiful aquascape that both you and your fish will love!