Question: Are Herbertia and Ammobium both perennial plants?

Context paragraphs:
Woody plant: A woody plant is a plant that produces wood as its structural tissue.  Woody plants are usually either trees, shrubs, or lianas.  These are usually perennial plants whose stems and larger roots are reinforced with wood produced from secondary xylem.  The main stem, larger branches, and roots of these plants are usually covered by a layer of bark.  Wood is a structural cellular adaptation that allows woody plants to grow from above ground stems year after year, thus making some woody plants the largest and tallest terrestrial plants.

Namib Desert dune ant: The Namib Desert dune ant, "Camponotus detritus", is a large ant species distinguished by white and black symmetrical stripes and markings on its hairy abdomen.  It has an average mass of 45 mg .  It is classified within the carpenter ant genus, a large group of more than 1,000 known species, many of which are associated with forested habitats in America and elsewhere.  However "C. detritus" inhabits the hot dry dunes of the hyper-arid central Namib Desert in Southern Africa.  Like many other ant species, it obtains its food and moisture by climbing the stalks of plants and drinking honeydew from scale insects, which themselves feed on shrubs and other perennial plants.  It will also feed on dead insects.  The nests of this species, located amongst perennial plant roots, are systems of tunnels and chambers between 100-400 mm deep.  Nests can reach temperatures of 35 C in summer, though they are much cooler in winter, typically 20-23 C .  Nests are often lined with detritus - hence the binomial Latin name of the species.  Each colony contains a single queen.

Perennial rice: Perennial rice are varieties of long-lived rice that are capable of regrowing season after season without reseeding; they are being developed by plant geneticists at several institutions.  Although these varieties are genetically distinct and will be adapted for different climates and cropping systems, their lifespan is so different from other kinds of rice that they are collectively called perennial rice.  Perennial rice—like many other perennial plants—can spread by horizontal stems below or just above the surface of the soil but they also reproduce sexually by producing flowers, pollen and seeds.  As with any other grain crop, it is the seeds that are harvested and eaten by humans.

Ammobium: Ammobium is genus of perennial Asteraceae species described as a genus in 1824.

Perennial grain: A perennial grain is a grain crop that lives and remains productive for two or more years.  While many fruit, nut and forage crops are long-lived perennial plants, all major grain crops presently used in large-scale agriculture are annuals or short-lived perennials grown as annuals.  Scientists from several nations have argued that perennial versions of today's grain crops could be developed and that these perennial grains could make grain agriculture more sustainable.

Dahlia: Dahlia ( or ) is a genus of bushy, tuberous, herbaceous perennial plants native to Mexico.  A member of the Asteraceae (or Compositae), dicotyledonous plants, related species include the sunflower, daisy, chrysanthemum, and zinnia.  There are 42 species of dahlia, with hybrids commonly grown as garden plants.  Flower forms are variable, with one head per stem; these can be as small as 2 in diameter or up to 1 ft ("dinner plate").  This great variety results from dahlias being octoploids—that is, they have eight sets of homologous chromosomes, whereas most plants have only two.  In addition, dahlias also contain many transposons—genetic pieces that move from place to place upon an allele—which contributes to their manifesting such great diversity.

Asparagus (genus): Asparagus is a genus of flowering plants in the family Asparagaceae, subfamily Asparagoideae.  It comprises up to 300 species.  Most are evergreen long-lived perennial plants growing from the understory as lianas, bushes or climbing plants.  The best-known species is the edible "Asparagus officinalis", commonly referred to as just "asparagus".  Some other members of the genus, such as "Asparagus densiflorus", are grown as ornamental plants.

Ephemeral plant: An ephemeral plant is one marked by short life cycles.  The word ephemeral means transitory or quickly fading.  In regard to plants, it refers to several distinct growth strategies.  The first, spring ephemeral, refers to perennial plants that emerge quickly in the spring and die back to their underground parts after a short growth and reproduction phase.  Desert ephemerals are plants which are adapted to take advantage of the short wet periods in arid climates. Mud-flat annuals take advantage of short periods of low water.  In areas subjected to recurring human disturbance, such as plowing, weedy ephemerals are very short lived plants whose entire life cycle takes less than a growing season.  In each case, the species has a life cycle timed to exploit a short period when resources are freely available.

Plants for a Future: Plants For A Future (PFAF) is an online not for profit resource for those interested in edible and useful plants, with a focus on temperate regions.  The project currently has a site in the South West of England where many of the plants are being grown on a trial basis, and maintains a small mail order catalogue.  The organization's emphasis is on perennial plants.

Herbertia (plant): Herbaceous and perennial plants, from tunicate, ovoid bulbs with brown, dry, brittle and papery tunics.  The stems are simple or branched.  The leaves are few, with the basal ones larger than the others; the blade is pleated, linear-lanceolate.

Supporting paragraphs: Herbertia (plant) Ammobium
Answer: yes