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weed seeds pop when touched

Flower Plants With Seeds That Pop Open

While some flowers have seeds without any armor at all and depend on insects or other plants for pollination, some have seeds that either have a very hard skin or are enclosed in a pod or shell. The majority of these types of seeds will pop open at some point during the plant’s life cycle, and some are even catapulted in several directions at the slightest touch.

Bluebonnet

Bluebonnets (Lupinus texensis) take a few seasons to establish, but when they do, they reseed and will bloom reliably each spring. Seeds are usually planted in October and November so they can grow through the winter. Buebonnets bloom from mid-March to mid-May. During this time they form a seedpod. This pod starts out green and soft and then yellows. In its last stage of maturity, it turns brown. The pod will look dry and a bit shriveled around this time. You can hear the seeds rattle if you shake the pod, and usually the seedpods will pop open when you touch them, revealing tiny, hard seeds.

The bluebonnet grows in the Texas Hill Country’s alkaline soil. Bluebonnets may have low germination the first two years because of the hard-coated seeds. Growers often scarify (nick) the seeds a bit to “weather” the seed and encourage germination. They scratch them with a knife, sand them or freeze and soak the seeds in boiling water.

Touch Me Not Seeds

To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.

  • If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
  • If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
See also  weed seed population

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