Pulmonary blood pressure is normally a lot lower than systemic blood pressure. Normal pulmonary artery pressure is 8-20 mm Hg at rest. If the pressure in the pulmonary artery is greater than 25 mm Hg at rest or 30 mmHg during physical activity, it is abnormally high and is called pulmonary hypertension.
Plant Types. Tropical hibiscus (Hibiscus rosa-sinensis) are evergreen, or shrubs that keep their leaves all year. On the other hand, hardy hibiscus, members of the genus Hibiscus with more than 200 species, are deciduous. Their leaves die off in winter. They have heights up to 15 feet and widths from 4 to 8 feet.
We hope you like our exotic, tropical hibiscus! We grow over 500 hibiscus hybrids, or varieties - cultivars in hibiscus lingo. Most of our varieties are hybridized right here in our own greenhouses, and are unique to HVH.ardy hibiscus bloom in late summer or early fall and have a shorter blooming season than tropical hibiscus. At HVH we don't grow any of the hardy hibiscus. We have tried in the past, but they don't grow well in our hot, dry California climate.