THE COASTAL GARDENER
06.23.06
Diving into liquid gardens
Although
a few of us enjoy full-scale water gardens, most of us don't have
the room or time to install and maintain one. A pond-in-a-pot is
an inexpensive alternative. You can set one up in only a few
minutes and it is a great way to introduce a few aquatic plants
into your gardening repertoire. Best of all, a potted water garden
requires almost no maintenance.
Just about any container that holds water can be used. Watertight ceramic and stoneware pots are the most popular. Stone troughs are excellent. Just about any size or shape will do, but I prefer a container that is a little wider than it is tall. Large flat bowls or low troughs, at least 12 inches tall, are my favorites. If you can't find an un-drilled pot you can easily plug holes with a bit of polyurethane sealant, available at a hardware store.
Place the container in a location with at least bright filtered sun. Be creative in the placement of your liquid garden. Patios and along walkways are traditional locations, but a well-placed container water garden can be a striking accent when placed into a landscape. A series of three complementary pots of slightly differing sizes, shapes or colors can be stunning. Remember, water is heavy and you won't want to move the pot once it is filled. Most blooming aquatic plants need full sun but many beautiful foliage plants are happy in bright filtered light.
If possible, choose containers with dark-colored interiors. Dark green, charcoal or black give the container an impression of greater depth. They also discourage algae growth, and it is less obvious when it is present.
Now you will need to select a few aquatic plants for your new garden. Depending on the size of the container, start with a spiky, erect plant, such as Sweet Flag, Yellow Flag Iris or Horsetail. Combine this with a broadleaf plant, like Giant Arrowhead or Imperial Taro. Add a low or cascading plant, such as Water Clover or Parrot Feather to spill over the edge. If space allows, finish off the planting with a floating plant, such as Water Lettuce or Water Hyacinth.
Don't crowd too many plants into a container. Two to three potted plants and some floaters will make quite an effect. Some clear water, free to reflect the sky and the plants above will look the most appealing.
When you select your aquatic plants be sure they are not planted in traditional potting soil. When submerged, this soil will float to the surface and cloud the water. Properly grown, an aquatic plant will be in pure, muddy clay, the same sticky mess that you despise in your terrestrial garden. Finally, here's an instance when you want clay soil.
When you bring home your new aquatic plants from the nursery you can simply leave them in the containers they're in, plop them right into your container and fill it with water. The black nursery pots will nearly disappear in the water. You'll probably be fine like this for the rest of the year. But by fall, you'll find that most of your plants are bursting out of their pots and will need repotting or dividing.
When re-potting an aquatic plant, use the heaviest clay soil you can find in your garden, avoiding any soils that have been amended. It's usually easier to just buy a bag of aquatic potting soil at a garden center.
Some aquatic plants prefer to be placed at certain depths in the water. Adjust the depth of your plants by placing bricks or an empty, upside-down terracotta pot under the pot so the crown of the plant is at the preferred depth.
When plants begin to grow, add a fertilizer tablet to each pot. Just push a tablet a couple of inches into the soil of each pot. If algae are persistent, remove the water plants, empty the container, refill with clean water, and replace the plants. Mosquitoes are seldom a problem in container water gardens. If they do develop, remove them by overfilling your container and letting the larvae run out with the water flowing over the top. Mosquito dunks, biologically safe and harmless to fish, humans and wildlife are another easy solution.
Other than replacing evaporated water and an occasional fertilizing and plant grooming there is little maintenance involved. After assembling your liquid garden, wait four to five weeks before adding fish. But be careful not to overstock your tub. A good rule of thumb is one goldfish or three gambezi (also known as mosquito fish) for each five gallons of water.
Container water gardens are really quite simple to make and are a pleasant accent to a summer landscape.
RON VANDERHOFF is the nursery manager at Roger's Gardens in Corona del Mar.
ASK RON
My new lawn has been beautiful for the past six months. Just
recently it has developed a couple of large, irregular brown
patches. I've read about fungus, lawn moths and grubs. Any
suggestions?
Michael
Newport Coast
From what you have described, I don't believe your issue is caused by insects or disease. I suspect that your sprinkler system simply is not applying enough water evenly.
Soon after the
weather warmed up three or four weeks ago, brown, dry areas began
appearing in turf areas all over Orange County. These brown
patches in lawns are a common condition at the moment and easily
seen with a drive through almost any neighborhood. Portions of the
lawn just aren't getting enough water. You can test this by
setting a couple of straight-sided drinking glasses in each of the
dry areas and two or three more in some green areas. Turn the
sprinklers on and let them go through their cycle. When finished,
compare the depth of water in the glasses from the healthy green
areas with those from the brown areas. My hunch is that your
irrigation system isn't delivering water as evenly as it might
appear. An adjustment to your sprinkler system or some
supplemental watering in these areas will solve the problem.
- Ron Vanderhoff, the Coastal Gardener
Send in your toughest gardening questions, and the expert nursery staff at Roger's Gardens will come up with an answer and publish it. Please include your name, phone number and city, and limit queries to 30 words or fewer. E-mail stumpthegardener@rogersgardens.com, or send to Plant Talk at Roger's Gardens, 2301 San Joaquin Hills Road, Corona del Mar, CA 92625.
