Water lilies fall into two categories, either Hardy (those originating from cooler climates) or Tropical (those originating from tropical or semi-tropical climates). Hardy water lilies are not necessarily hardier than tropical water lilies, it is just a name given to them because they can survive harsh European winters. Hardy water lilies and Tropical water lilies grow equally well in the Perth region. Even with the occasional frosts experienced in country areas, Tropical water lilies seem to thrive
Most water lilies require full morning sun of at least 5 -6 hours and regular fertilizing for flowering. In Perth nearly all lilies lose their leaves over the winter months, they have not died, just gone dormant ready to return in the warmer months. Planting a variety of both Hardies and Tropicals in your pond will give you flowers for a greater part of the year. Please note the growing seasons quoted below are intended as a guide, the actual growing season may vary depending upon weather variations from year to year and your location.
Hardy water lilies
The Hardy water lily has a growing season from September/October through to April. The best time to commence fertilizing and if necessary re-pot your hardy water lily is in July/August. We recommend 2 to 4 Manutec fertilizer tablets be pushed deep into the soil around each lily in August. Continue to fertilize with 2 Manutec tablets per plant every 2 months through to the end of February.
Tropical water lilies
Tropical water lilies have a growing season from November/December through to June. The best time to commence fertilizing and if necessary re-pot your tropical water lily is in October/November. We recommend 2 to 4 Manutec fertilizer tablets be pushed deep into the soil around each lily in November. Continue to fertilize with 2 Manutec tablets per plant every 2 months through to the end of April.
Algaecide products and your water lily
The use of any Algaecide product in your pond may be detrimental to your water lily. These products often claim they do not harm pond plants and that they are all natural, however, these products are unable to distinguish the difference between algae and other water plants. Algaecides often weaken water lilies over a period of time, reducing flowering, causing leaves to rot prematurely and even killing the water lily outright. Tropical water lilies seem to be particularly sensitive to algaecide products. Please see our fact sheet on algae in your pond to help you address algae problems in your pond without resorting to algaecide products.
Aphids and your water lily
Aphids are attracted to water lilies and are a particularly annoying problem in the summer months. The use of any chemicals to kill aphids will also result in death of your fish. We recommend the application of a small amount of olive oil to the water lily leaf. Once applied the aphids quickly die, they can then be gently sprayed off with water and removed from the pond with a fine net.
Caddis Fly and your water lily
Caddis Fly is a moth like creature whose larvae can cause great damage to water lilies. These larvae use pond debris and water lily stems to build cases in which they move around the pond, mostly at night. Generally the first sign of Caddis Fly infestation in your pond is the appearance of lily stems, leaves and flower buds that appear to be cut cleanly off the lily plant. If you head out to your pond at night with a torch you can often see the Caddis Fly larvae moving around the pond, they appear as moving sticks on the base of the pond and on lily stems. Once the Caddis Fly larvae reach this size they are usually too large for Goldfish to eat. The best way to control Caddis Fly is by keeping a good number of fish in your pond. If you have a small pond with small fish you may need to manually pull the Caddis Fly larvae from the pond.
Other tips for successfully growing water lilies
and remember Water Lilies lose their leaves over winter - don't throw them in the bin because you think they have died!