Marsilea quadrifolia, commonly known as four-leaf clover or water clover, is a fascinating aquatic plant that belongs to the family Marsileaceae. It is known for its unique appearance, resembling a clover with four leaflets.

Here is a detailed description and care guide for Marsilea quadrifolia:

Description:

Appearance: Marsilea quadrifolia features delicate, clover-like leaves that grow in clusters. Each leaf is divided into four leaflets, giving it a distinct four-leafed appearance. The leaflets are typically green but can sometimes exhibit reddish or bronze tones, especially under high light conditions.

Growth habit: This plant has a creeping and spreading growth habit, forming a dense carpet-like mat of foliage. It sends out runners, known as rhizomes, which produce new plantlets at the ends. The size of the leaves and overall growth pattern may vary depending on the specific environmental conditions.

Size: Marsilea quadrifolia can reach a height of 2 to 5 inches (5 to 13 centimeters) under optimal conditions, forming a low-growing carpet.
Care Guide:

Lighting: Marsilea quadrifolia prefers moderate to high lighting levels. Provide at least 2 to 3 watts per gallon of light intensity to promote healthy growth. Use full-spectrum bulbs or LED lights specifically designed for aquatic plant growth.

Water conditions: This plant thrives in slightly acidic to neutral water conditions with a pH range of 6.0 to 7.5. It can tolerate a wide range of water hardness but generally prefers slightly soft to moderately hard water. Maintain a water temperature between 68°F (20°C) and 82°F (28°C).

Substrate: Marsilea quadrifolia requires a fine-grained substrate, such as sand or fine gravel, to establish its root system. A nutrient-rich substrate or the addition of root tabs can provide essential nutrients for healthy growth.

CO2 and nutrients: While Marsilea quadrifolia can grow in low to medium CO2 levels, providing additional CO2 supplementation will promote healthier and faster growth. Regular fertilization with a comprehensive aquatic plant fertilizer will ensure the plant receives necessary nutrients.

Maintenance: Trim the plant regularly to prevent it from becoming too dense and to promote new growth. Gently remove any dead or decaying leaves to maintain the overall health and appearance of the plant. Monitor and control algae growth to prevent it from overtaking the Marsilea quadrifolia carpet.

Propagation: Marsilea quadrifolia spreads through runners or rhizomes that produce new plantlets. Once the plant has established a strong root system, it will send out runners, allowing it to expand and create a dense carpet. You can propagate it by separating the runners and replanting them in desired areas.

Overall, Marsilea quadrifolia is a captivating and unique aquatic plant that adds a touch of charm to aquariums and planted tanks. With proper care and maintenance, it can create a lush and natural-looking carpet, resembling a field of four-leafed clovers.