s are an annual plant.
An annual plant is a plant that completes its life cycle
, from germination
to the production of seed
s, within one growing season
, and then dies. The length of growing seasons and period in which they take place vary according to geographical location, and may not correspond to the four traditional seasonal divisions of the year. With respect to the traditional seasons annual plants are generally categorized into summer annuals and winter annuals. Summer annuals germinate during spring or early summer and mature by autumn of the same year. Winter annuals germinate during the autumn and mature during the spring or summer of the following calendar year.
One seed-to-seed life cycle for an annual can occur in as little as a month in some species, though most last several months. Oilseed rapa
can go from seed-to-seed in about five weeks under a bank of fluorescent lamp
s. This style of growing is often used in classrooms for education. Many desert annuals are therophyte
because their seed-to-seed life cycle is only weeks and they spend most of the year as seeds to survive dry conditions.
In cultivation, many food plants are, or are grown as, annuals, including virtually all domesticated grain
s. Some perennials
are grown in gardens as annuals for convenience, particularly if they are not considered cold hardy
for the local climate. Carrot
are true biennials (divarsiya) that are usually grown as annual crops for their edible roots, petioles and leaves, respectively. Tomato
, sweet potato
and bell pepper
are tender perennials usually grown as annuals. Ornamental perennials commonly grown as annuals are impatiens
, wax begonia
. Examples of true annuals include corn
Summer annuals sprout, flower, produce seed, and die, during the warmer months of the year.
The lawn weed crabgrass
is a summer annual.
Winter annuals germinate in autumn or winter, live through the winter, then bloom in winter or spring.
The plants grow and bloom during the cool season when most other plants are dormant or other annuals are in seed form waiting for warmer weather to germinate. Winter annuals die after flowering and setting seed. The seeds germinate in the autumn or winter when the soil temperature is cool.
Winter annuals typically grow low to the ground, where they are usually sheltered from the coldest nights by snow cover, and make use of warm periods in winter for growth when the snow melts. Some common winter annuals include henbit
, and winter cress
Winter annuals are important ecologically, as they provide vegetative cover that prevents soil erosion during winter and early spring when no other cover exists and they provide fresh vegetation for animals and birds that feed on them. Although they are often considered to be weeds in gardens, this viewpoint is not always necessary, as most of them die when the soil temperature warms up again in early to late spring when other plants are still dormant and have not yet leafed out.
Even though they do not compete directly with cultivated plants, sometimes winter annuals are considered a pest in commercial agriculture, because they can be hosts for insect pests or fungal diseases (ovary smut – Microbotryum sp) which attack crops being cultivated. The property that they prevent the soil from drying out can also be problematic for commercial agriculture.
In 2008, it was discovered that the inactivation of only two genes in one species of annual plant leads to the conversion into a perennial plant
Researchers deactivated the SOC1 and FUL genes in ''Arabidopsis thaliana
'', which control flowering time. This switch established phenotypes
common in perennial plants, such as wood formation.