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How many plants do I need in my pond, and do I need to fertilize them? | Decorative Ponds & Water Gardens Q & A

Q: How many plants do I need in my pond, and do I need to fertilize them?

Q: How many plants do I need in my pond, and do I need to fertilize them?

Cynthia – Bishop, CA

A: A good mix of aquatic plants does more than beautify your water garden. The marginal, floating and submerged plants, such as those found in our Aquatic Plant Packages, also absorb excess nutrients in the water and shade the pond’s surface, which can help prevent algae attacks and protect your finned friends from hungry herons and raccoons.

When planting aquatic plants in and around your pond, you should ideally have 40 to 60 percent of your water garden’s surface covered with floating aquatic plants, like hardy water lilies, water hyacinth and water lettuce. This allows for enough nutrient absorption and shading to prevent algae from gaining a foothold in your pond.

Just like the plants in your vegetable garden, those lilies and bog plants need some nutrients added to their soil to thrive. Here’s what we recommend:

  • Spikes: Fertilizer spikes, like Laguna Plant Grow Fertilizer Spikes, slowly release plant food, which makes them super easy to use. The balanced nutrients in the spikes encourage both foliage and root growth and flower production, while the low phosphorous and no copper formula ensure no adverse effects on water quality or fish and plant life. You simply push the spike into the soil (one for every 1 to 2 gallons of planting container space) and forget about it until next year.
  • Tabs: Tabs, like TetraPond® LilyGro™ Aquatic Plant Food, are formulated for use during your aquatic plants’ growing season. As with the spikes, the nutrients in the fertilizer encourage greenery and bloom production, but the tabs need to be added to the soil monthly for best results. Using one tablet per gallon of potted soil, push it deep into the soil 3 inches from the crown of the plant and pack the hole with dirt to prevent the fertilizer from being released into the water.

During the growing season, plan to fertilize your water lilies and marginal plants once per month. Floating and submerged plants should have plenty of nutrients in the water to feed them. Enjoy your blooms!

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