If you have a large greenhouse full of poinsettias growing and reflowering can be tricky. However, if you only have a few plants in your home it is easy.

Fortunately, there is plenty of information available on how to control these conditions properly.

The main conditions for growing poinsettias:

• Night temperatures above 50 F.
• Daytime temperatures below 70 F.
• A period of uninterrupted long, dark nights for about 2 months in the fall.

The ideal is to have a temperature of about 69 F all the time.

This is true of growing new plants or to get a plant to reflower in subsequent years.

How to make poinsettias flower or reflower:

• Light your poinsettia plants with grow lights until 2 a.m. until Sept. 25. Then cover with a black cloth from 5 p.m. until 8 a.m. until Oct. 15, followed with natural day lengths.
• Keep the temperature at 69F all the time.

Read more about Poinsettia Cultivation Flowering and Reflowering.

Legend has it that poinsettias have been involved in Christmas miracles. One especially charming one involves a poor child who gave weeds from the side of the road as a gift to his church suddenly springing to full scarlet red poinsettias.

Read more about Poinsettias in Legend.

Poinsettia plants have brightly colored leaves (bracts) that are often mistaken for flowers. The poinsettia true flowers are small yellow or green structures at the base of the bracts.

This familiar form of poinsettias are due to careful breeding, cultivation and harvesting. In the wild, poinsettias are a shrub or small tree. Poinsettias are originally from Mexico and Central America.

Read more about Poinsettia Description.

Poinsettias are named after Joel Roberts Poinsett, the first United States ambassador to Mexico, who introduced the plant in the U.S. in 1825.

Paul Ecke of Encinitas, California was responsible for the technological advance that made poinsettias a successful commercial plant. One key to poinsettia profits is getting the plants to grow so that multiple branches come off one stem, creating a fuller, more colorful plant.

The Eckes' technique, which involved grafting two varieties of poinsettia together, made it possible to get every seedling to branch. Ecke had perfected this poinsettia secret before 1910 and his family had a virtual poinsettia monopoly for about 80 years. Around 1996 a university researcher made the same discovery and made the technique public.

Since then the Eckes Poinsettia Ranch has adapted and now is a great source of technical assistance and research funding for both commercial growers and consumers.

Read more about Poinsettia Origins.

Poinsettias are a shrub that; as this photo proves, grow to the size of a small tree with thick trucks.

Image by Martin LaBar

Image by Old Shoe Woman.

The photo below is a great closeup shot of the true flowers of a poinsettia plant. The poinsettia true flowers in this picture are just opening. Unopened true flowers is one important sign that the poinsettia blooms will last a long time. This is an important tip when buying poinsettias.

Image by Tzatziki.

Read more about Poinsettia True FLowers.

cranberry fruit on a cranberry bush

Cranberries are low, creeping shrubs or vines up to 10 cm tall (often less), with slender, wiry stems, not thickly woody, and small evergreen leaves. The flowers are dark pink, with very distinct reflexed petals, leaving the style and stamens fully exposed and pointing forward. The fruit is a true berry that is larger than the leaves of the plant; it is initially white, but turns a deep red when fully ripe. It is edible, with an acidic taste that can overwhelm its sweetness.

Cranberries are a traditional Thanksgiving food in the United States.

Read more about the Cranberry.

Outside the Balboa Park Botanical Building in San Diego, California.

Balboa Park is a cultural complex in San Diego, California.

The Botanical Building plantings include more than 2,100 permanent plants, featuring fascinating collections of cycads, ferns, orchids, other tropical plants, and palms.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny.

Image by hey_skinny

Image by hey_skinny

A barrel cactus with blooms turning to fruit.

The Balboa Park Desert Garden contains more than 1,300 plants, including succulents and drought-resistant plants from around the world, within its 2.5 acres.

The peak blooming period is January through March; however, these plants are interesting at any time of year because of their unusual shapes.

This should help when you are buying an arrangement from a florist or grower.

You might also get some good ideas for your lawn and garden.