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Tag Archives: Drawing

Tunicate Bulbs

The Garden Artist Posted on March 26, 2017 by Mary AhernFebruary 27, 2020

Tunicate bulbs are some of the most familiar bulbs we come in contact with both in and out of our gardens.

Many underground plant structures are generally named bulbs. A definition of a bulb is a plant that incorporates its entire life cycle in an underground storage unit. Technically true bulbs are compressed stems surrounded by fleshy leaves acting as food storage organs. They are in the Monocot family of plants.

Graphite Drawing of a Onion and Garlic bulbs by the Artist, Mary Ahern

Graphite Drawing of  Onion and Garlic bulbs by Mary Ahern.

Bulbs can be further classified by looking at their various growth habits. Some of these “bulbs” are actually further classified as “true” bulbs, corms, tubers and rhizomes. Examples of these bulbs respectively are: narcissus, crocus, dahlia and canna. 

True bulbs are represented by two classifications, tunicate and imbricate as represented by onions and lilies in that order. 

Tunicate bulbs have a dry thin paperlike sheath surrounding them which helps to prevent them from drying and improves their storage capability. The basal base plate along with the tunicate sheath hold the bulb together. Roots emerge at the bottom of the basal plate.

We enjoy these bulbs both in the kitchen and in our gardens. Our cooking is enhanced by the addition of the tunicate bulbs of onions, garlic and shallots. The joyous colors in our early spring gardens are presented by our daffodils, tulips and hyacinths. 


 

Posted in Botanical Art, Horticultural Info, Plants, Traditional Art | Tagged Art, Botanical Art, Bulbs, Drawing, Gardening, Horticulture, Illustration

Anatomy and Propagation of a True Bulb

The Garden Artist Posted on January 15, 2017 by Mary AhernMarch 26, 2017

BULBS

Bulbs (which are referred to as “true bulbs”) grow in layers, much like an onion. At the very center of the bulb is a miniature version of the flower itself. It is composed of a shortened stem covered with modified leaves called scales. Helping the bulb to stay together is something called a basal plate, which is a round, flat area that are the beginnings of the roots on the bottom of the bulb.

Many plants such as daffodils form new bulbs around the original bulb. These bulbs, called offsets, develop from buds within the base of the mother bulb and produce new plants. When these bulbs become overcrowded, the flowers start to diminish in size. This is an indication that it is time to dig up and divide the bulbs.

Examples of True Bulbs: Tulips, Daffodils and Alliums commonly known as Onions

Tunicate Bulb Anatomy of an Onion by the Artist, Mary Ahern

After I finished the drawing I cut up the onion and put it in a stir-fry for dinner. Yummy!

 

TRUE BULBS ANATOMY

The true bulb has five major parts.

BASEL PLATE: bottom of the bulb which hold the bulb together and from which the roots grow

FLESHY SCALES:

primary storage tissue

TUNIC:

skin-like covering that protects the fleshy scales

SHOOT:

consisting of developing flower and leaf buds

LATERAL BUDS:

develop into bulblets or offsets

Posted in Botanical Art, Horticultural Info, Plants, Traditional Art | Tagged Botanical Art, Bulbs, Drawing, Horticulture, Illustration

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