Why is Portulaca grandiflora called "sunflower" (sun flower), and are the two the same plant?

In the world of flowers, the easiest to confuse are certainly Portulaca grandiflora and the "sunflower" (sun flower). The reason these two flowers are hard to tell apart is that their flower colors are mainly bright, and both bloom in the sun and close when the sunlight is weak, so this unique habit further aggravates some flower lovers' misidentification. Moreover, they also overlap to some extent in growth form - for example, both like warm climate conditions, and both can show tenacious vitality in garden landscapes. So how do you quickly distinguish these two flowers in daily life? Let's take a look below.

Growth habits

Although Portulaca grandiflora and the "sunflower" look similar when blooming, if you observe carefully, Portulaca grandiflora likes to grow in full sunlight, with a suitable growth temperature of 20-30°C, while the "sunflower" prefers a full-sun environment and will fail to bloom in dark, damp environments, whereas Portulaca grandiflora is relatively less delicate. As for soil, the two flowers are not strict, and both like fertile, well-drained soil.

Morphological characteristics

To distinguish Portulaca grandiflora and the "sunflower" by morphological characteristics: from the leaf shape, the leaves of Portulaca grandiflora are smaller and finer than those of the "sunflower"; the former has fine teeth or wavy edges on the leaves, while the edges of the "sunflower" are smooth. Looking closely at the flowers, Portulaca grandiflora is also smaller than the "sunflower"; the former's flower colors are mostly yellow or orange, and the petals are not thick but rather thin, while the petals of the latter, the "sunflower", are relatively thick. To find a distinction at the stem, the stem of Portulaca grandiflora is thinner and weaker, and the stem color is light green or dark red, while the stem of the "sunflower" is thicker and sturdier, and its branches and leaves are only emerald green.

Genus and species differences

Although Portulaca grandiflora and the "sunflower" are somewhat related, to distinguish them: Portulaca grandiflora is an annual herbaceous plant of the genus Portulaca, mostly distributed in domestic regions. The "sunflower" is a perennial flower of the genus Portulaca, originating from the Brazil region of South America, and was only introduced to our country in recent years.

Through the comprehensive observation of the above characteristics, we can relatively accurately distinguish Portulaca grandiflora and the "sunflower".