Bitterbark is a native of Australia and hardy in USDA zones 9 through 11. The dried fruits explode and send seeds three feet into the air. The sandbox tree sends its seeds hurling nearly 150 feet, and the exploding seed pods create a loud noise comparable to a rifle discharge. The sandbox tree is hardy only in USDA zones 10 through 11. The rubber tree , the source of natural rubber, can shoot its seeds 50 feet from the tree. It’s hardy in USDA zone 10 through 11.
Another plant that shoots seeds when touched is Euphorbiaceae. The Euphorbia family produces segmented seed capsules that somewhat resemble a peeled orange in shape. Examples of plants in this family include bitterbark (Petalostigma spp.), the sandbox tree (Hura crepitans), and the rubber tree (Hevea spp.)
Some plants disperse their seeds forcefully by ejecting them. Sometimes the tension is so great, seeds may be ejected up to 200 feet away from the mother plant. This method of seed dispersal is called “ballistichory,” a label that hints at the projectile-like emergence of seeds from their pods or capsules. This type of seed dispersal occurs because the fibers in the dried fruit pull against each other to create tension, and when the tension is great enough, the fruit splits open and the walls of the fruit spring back, flinging the seeds out with force.
Acanthaceae: Exploding Shrubs
One of the largest groups of plants that uses ballistichory is the pea family, or Fabaceae. This is just one type of plant that shoots seeds when touched and the pod is cracked open. Lupins (Lupinus spp.), a garden favorite that’s hardy in U.S. Department of Agriculture plant hardiness zones 3 through 9, form columns of pea-like fruits that burst open when dry. Orchid trees (Bauhinia spp.), hardy in USDA zones 9 through 11, bear large pods that can fling seeds nearly 50 feet. Gorse (Ulex spp.), an aggressive broom-type plant that is considered a noxious weed in some states, makes a popping noise when the seed pods burst open.
The Acanthus family (Acanthaceae) produces a number of shrubs that distribute seeds through explosive action. Most produce highly ornamental flowers. The Mexican petunia (Ruellia spp.) has small petunia-shaped flowers and produces pods that disperse seeds up to 10 feet away. Mexican petunias are hardy in USDA zones 8 through 10, and may be an invasive plant in some states. Justicia produces colorful flower spikes and is hardy in USDA zones 9 through 11. The seed capsules explode when mature. Firecracker plants (Crossandra spp.) are aptly named because of their pretty orange flowers and exploding seed pods. These capsules dry out first then pop open once they become moist again.
Some plants in the mallow family (Malvaceae) disperse seeds via ballistichory. The common garden vegetable okra (Abelmoschus spp.) is a plant that shoots seeds when touched, projecting its seeds several feet. Okras are annuals that are hardy in USDA zones 4 through 11. The kapok tree (Ceiba pentandra, also known as cotton tree) is native to South America and produces cream-colored flowers with an unpleasant smell. The pods burst open, sending both seeds and the exploding seed pod’s cottony insulation into the wind. Kapok trees are hardy in USDA zones 10 through 11.
Mowing will achieve control over time. Do it frequently enough that you remove the flower heads before they become seed pods.
Pulling out hairy bittercress weed usually leaves the root behind. The plant will re-sprout from healthy weeds and the problem persists. You can, however, use a long slim weeding tool to dig down and around the taproot and get all the plant material out of the ground.
Late winter and spring signal growth of all plants, but especially weeds. Annual weed seeds overwinter and then burst into growth towards the end of the season. Hairy bittercress weed is no exception. What is hairy bittercress? The plant is an annual weed, which is one of the earliest to sprout and form seeds. Control for hairy bittercress starts early in the season, before flowers turn to seed and get a chance to spread.
Cultural Control for Hairy Bittercress
The weed prefers cool, moist soil and is most prolific after early spring rains. The weeds spread quickly but their appearance reduces as temperatures increase. The plant has a long, deep taproot, which makes pulling them out manually ineffective. Control for hairy bittercress is cultural and chemical.
Prevent invasions into turf areas by encouraging good grass growth. The weeds easily infest thin or patchy areas. Apply several inches (8 cm.) of mulch around landscape plants to help prevent seeds from getting a foothold in your soil.
This pesky weed is small enough to hide among your landscape plants. Its extensive seed expulsion means that just one or two weeds can spread quickly through the garden in spring. Early control for hairy bittergrass is essential to protect the rest of the landscape from an infestation.
Hairy bittercress weed (Cardamine hirsuta) is an annual spring or winter pest. The plant springs from a basal rosette and bears 3 to 9 inch (8-23 cm.) long stems. The leaves are alternate and slightly scalloped with the largest at the base of the plant. Tiny white flowers develop at the ends of the stems and then turn into long seedpods. These pods split open explosively when ripe and fling seeds out into the environment.