CFL Grow Lamps

August 31, 2018

Many compact fluorescent lamps (CFLs) do not require a special ballast, so you can simply use them in your standard light fixtures such as ceiling, spotlights, or floor lamps.

A large 250 watt CFL lamp with reflector hood.
PC: Sunlight Supply, Inc.

Large CFLs, such as those in the 250-watt range, will require a special fixture and reflector that can accommodate the larger base on the bulb.

Gardening Under Lights Book


Use Porous Pots to Grow Orchids Indoors

August 30, 2018

When it comes to keeping houseplants, not every plant will thrive in the same type of container. Some plants, such as orchids, do best when their roots are exposed to the air.

An orchid planted in a porous pot with a loose orchid bark mix.
PC: Leslie F. Halleck

Porous pots are a must for orchids. In general, most orchids prefer high humidity with a very well-drained and aerated potting mix. Many common orchids are epiphytes (air plants) that can’t survive in a wet, heavy potting mix. Look for pots with holes in them to allow orchid roots to reach the air.

New BOOK! Gardening Under Lights: The Complete Guide for Indoor Growers


When to Transplant Seedlings

August 29, 2018

A common newbie mistake is to allow the seedlings or cuttings to remain in their original seed plug or cell for too long. Those tiny 2-inch pots and pods are not meant to sustain your plant indefinitely. Your plants will be most happy when they have room to stretch their roots.

This tomato transplant is filling out its 4-inch container.
PC: Leslie F. Halleck

Once the roots of your seedlings or cuttings have grown to the edges of their seed plug or pot and have sprouted three or more true leaves, it is time to bump them up to larger containers.

Gardening Under Lights Book


Fixtures for Fluorescent Grow Lights

August 28, 2018

You can use any sort of fixture for your fluorescent lamps -shop fixtures are just fine - but you need to make sure they will fit T5 or HO T5 lamp tubes.

PC: Sunlight Supply, Inc.

Many home-improvement stores will carry a bevy of basic fluorescent lamps, and some may stock fluorescent grow lights. But don’t rush to the hardware store and grab just any fluorescent tube. You should distinguish between fluorescents used for ambient room lighting and those designed for plant growth.

Gardening Under Lights Book


LED Growing Units

August 27, 2018

Small self-contained LED growing units aim to provide both ambient full-spectrum and blue or red spectrum light for plant growth. LED lamps produce only about a quarter of the heat that other high-intensity lamps emit because they can convert more watts into light.

PC: Leslie F. Halleck

Low heat output also means you can place LEDs close to your plants without the risk of scorching foliage or damaging young seedlings. LED units like this one can be used to grow small succulents, tropicals, or low-growing herbs.

Gardening Under Lights Book


Rooting Brugmansia Cuttings

August 26, 2018

Plants that are fast rooters, such as angel’s trumpet (Brugmansia sp.), usually do just fine rooted directly into potting soil. They root before they rot.

PC: Leslie F. Halleck

While you can root your cuttings directly in potting soil, you can also use inert media (peat, coir, soil-less potting mixes). Bioactive soils may contain pathogens that can rot the stem of your cutting before it has a chance to produce roots.

Gardening Under Lights Book


Miltonia Orchids Can Grow in Low Light

August 25, 2018

Miltonia is a low light orchid (200-300 PPF) that sports impressive blooms and a nice fragrance. So if you want to grow orchids indoors, but suffer from only moderate light levels, you can give Miltonia orchids a try.

PC: Leslie F. Halleck

Some orchids will benefit from high light conditions in summer (or winter if you’re south of the equator) and may fall into two categories, depending on the season. Therefore, you will sometimes see Miltonia listed as a medium light orchid (300-600 PPF).

New BOOK! Gardening Under Lights: The Complete Guide for Indoor Growers


Grow Basil Indoors

August 24, 2018

Basil is one of the easier herbs to grow, as long as temperatures are on the warm side. Plants should never be exposed to temperatures below 40 F. Basil needs bright light indoors, with direct full-sun exposure for 6 to 8 hours outdoors. Choose cool-spectrum HO T5, CFL, LED, MH/CMH grow lamps.

PC: Ball Horticultural Company

Basil does not require a lot of space and grows easily in containers. Some varieties are very compact, reaching only 8 inches tall, while others can get much larger. If you have limited space, choose dwarf cultivars.

New BOOK! Gardening Under Lights: The Complete Guide for Indoor Growers


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