Assorted Water Lilies

What sets Hardy Water Lilies apart from Tropical Water Lilies? Hardy water lilies and tropical water lilies exhibit distinct characteristics due to their origins and environmental preferences. Here's a comparison:

1. Origin and Climate Preference:

   • Hardy Water Lilies: Most hardy water lilies have their roots in cooler regions of the Northern Hemisphere. They can withstand severe frost as long as their rhizomes (crown/root stocks) remain unfrozen. It's important to note that there are no native hardy water lilies in Australia.
   • Tropical Water Lilies: Tropical water lilies thrive in warmer climates. They produce flowers that rise significantly above the water surface, typically reaching heights of around 30cm. These lilies are known for their vibrant flowers, which can range from pinks, reds, whites, and yellows to even purples and blues.

2. Flower Position and Colors:

   • Hardy Water Lilies: Their flowers tend to float on the water surface or hover just above it. They come in various colors, including apricots, pinks, reds, whites, and yellows. Some hardy water lilies are known as "changeable" as their flower colors can shift.
   • Tropical Water Lilies: Tropical water lilies produce flowers that stand upright above the pond water. Their flowers can also display a wide range of colors, such as pinks, reds, whites, yellows, purples, and blues.

3. Leaf Characteristics:

   • Hardy Water Lilies: Typically, the leaves of hardy water lilies have smooth, rounded edges.
   • Tropical Water Lilies: In contrast, tropical water lilies produce leaves with toothed or scalloped edges.

Now, let's delve into the key factors influencing the successful flowering of hardy water lilies:

4. Flowering Performance:

   • Hardy Water Lilies: Flowering performance varies among different varieties. Some may produce only a few flowers per month, while others can bloom frequently. Varieties with white and pale pink flowers tend to produce fewer blooms. Some may take time to flower and require the formation of a rhizome colony before they do.

5. Day Length:

   • Hardy Water Lilies: The length of the day is a significant factor influencing flowering. In regions with greater day length variations, like southern Australia, flowering often coincides with the equinox when day and night lengths are equal. This typically occurs from late September to late March. In tropical areas where day lengths remain more constant, flowering can start earlier and extend over several months.

6. Temperature:

   • Hardy Water Lilies: Flowering in hardy water lilies typically begins when water temperatures rise above 16-18°C. Some red-pink varieties may be susceptible to petal burn at temperatures exceeding 32°C. Varieties adapted to colder climates may slow down or stop flowering during hot summer months.

7. Plant Size and Vigor:

   • Hardy Water Lilies: Larger plants tend to produce more flowers. It's recommended to plant hardy water lilies in containers of at least 20cm in diameter to allow for healthy root development. Vigorous growth is essential for optimal flower production. Using slow-release fertilizer tablets can promote healthy growth and flowering.

In summary, while hardy water lilies and tropical water lilies have differences in origin, appearance, and environmental preferences, successful flowering in hardy water lilies depends on factors like day length, temperature, plant size, and vigor. Understanding these factors can help gardeners cultivate these beautiful aquatic plants effectively.