- Associated Press - Monday, August 1, 2011

Remember those old elementary-school terrariums - lidded aquariums filled with plants or plastic soda bottles growing science projects?

Today’s aquariums are chic and rule-busting, popping up in interior design and gardening stores. They now include many different materials and plants. In fact, today’s miniature worlds under glass can be simple still lifes - no living parts need participate.

“There’s a little maintenance to it, but it’s very, very low maintenance,” says Amy Bryant Aiello, who owns a terrarium shop, Artemisia, with her husband, Michael Aiello, in Portland, Ore. She also wrote a book, “Terrarium Craft,” that includes how-to steps for building a beautiful and long-lasting terrarium, and 50 projects for inspiration. She uses materials including mosses and lichen, quartz crystals, river rocks, seashells, glass pebbles and driftwood.

“The idea is to play with the materials and enjoy the process itself,” Mrs. Aiello said in her book’s introduction.

More examples of grownup terrariums are presented in Tovah Martin’s book “The New Terrarium.”

A well-planted terrarium can thrive for many years, provided you have the right materials and location.

Some plants, such as ferns, prefer bright, indirect light, whereas a succulent, such as cactus, prefers a stronger, direct light. Air plants, which don’t root in soil and are handily watered - with a good soaking every week or two - do well in terrariums, Mrs. Aiello said. Houseplants in 2- to 4-inch pots work best.

Instead of the traditional layering of rock, charcoal and soil in a terrarium, Mrs. Aiello uses high-quality sand. Depending on the plant, she may use some soil to help it get established. Otherwise, she leans toward the many-colored, sterile sands, often layered with pebbles or shells, for their visual impact through clear glass.

Her favorite sands are garnet, which is reddish-purple; hematite, which is black; pure quartz, which is creamy-white; and Monterey beach sand, which is tan.

Beach and play sands are a no-no in a terrarium, said Mrs. Aiello, because they’re not sterile. “Dirty” sand must be washed, screened and kiln-dried to be safe for plants. The Monterey beach sand, often used in fish aquariums, is available processed this way.

Kathie Helmericks has been making terrariums for about a year, and they fill the tabletops and shelves of her Fort Collins, Colo., home. She recently started a business, Glass Garden Terrariums, and sells her verdant creations in small Denver shops.

“It’s been an obsession with me,” Miss Helmericks said. “It’s really fun.”

Miss Helmericks uses sterile soil in her terrariums. She warns that “unclean” soil might harbor fungus gnats or their larvae, and notes that bugs also can be introduced into a terrarium by plants. Inspect healthy plants before introducing them into a terrarium, she advised.

The glass container can amount to half the cost of a store-bought terrarium, and can run into the hundreds of dollars.

Miss Helmericks wanders thrift shops and flea markets in search of unique glass containers for her biospheres. Mrs. Aiello recommends Ikea for inexpensive glassware. She uses vessels with small openings for nonliving terrariums. Colored sand, dried moss, seedpods and shells are just a few things that can be used.

“I still think it’s a little world,” Mrs. Aiello said.

Terrariums can be enclosed, or open at the top for air flow, Mrs. Aiello said. An open, “dry” terrarium - planted with drought-tolerant succulents - only needs watering every two to three weeks, depending on climate. A closed, “wet” terrarium is a little trickier: Miss Helmericks warns against over-watering when planting. She opens her closed terrariums every morning for an hour to let them breathe and to release condensation.

“That’s how most people kill terrariums,” said Miss Helmericks. “They over-water, and they don’t take the lids off.”

Mrs. Aiello said she sees renewed interest in terrariums as pushback in a fast-paced, technologically driven world.

“When people come into my shop, it’s filled with all these beautiful things from nature, and it feeds something in them that nothing else can,” she said.

Copyright © 2016 The Washington Times, LLC.

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