系统思维的超越可持续发展有机园艺

Tillage and soil disturbance brings one other thing to light – weed seeds. I can’t help but think about weeds at this time of the year since I’ve casually observed plenty of patches of weedy hell just traveling through residential neighborhoods.

杂草会从你离开，如果你不留在他们顶部. That’s just what weeds are consummately equipped to do thanks to their genetic heritage and reproductive strategy – live 几乎, 夭折, and crank out seeds in vast numbers. The seeds then bide their time near the soil surface until the conditions are right to replicate the growth cycle all over again.

The plant species we call “杂草” are really nothing more than plants we have judged as unwanted because they’re the wrong plants in the wrong places. 一方面, they tend to be non-native to the places that are being colonized. 另一, weedy species tend to not encounter built-in biological controls that keeps their population growth in check in their native ecosystems. That means that nothing in their new host environments has learned to exploit the weeds as a food resource…但.

For lack of natural controls to keep weed populations in check, it’s on us to impose that constraint in our gardens and landscapes. It’s late April now in Southern CA and the majority of weeds have set seed. The best time to set the weeds back is just after the first winter rains. 让杂草长大了一点，但然后拉 (deep tap rooted species like dandelion, 野生萝卜, or cheeseweed) 而湿润的土壤仍是他们或割草 (草只) 当他们设定的花 (inconspicuous on grass species) 但不要等到杂草种子集. 就像生活中许多事情, timing is everything. If you’re wondering why it’s not helpful to wait until the plants set seed, it’s because the seeds of some species are viable plant embryos long before they’re separated from the parent plant. 当您等待, you inadvertently add to the weed seed “bank” in the soil.

耕作使事情更糟. Some weed seeds no doubt are killed in the process but the majority are just “warehoused” by tillage. It’s like putting them in the equivalent of a bank security deposit box. Without tillage, most seeds will remain at the soil surface. 蚂蚁进行一些种源，, earthworms consume other seeds and redeposit them in castings, and gophers and other animals move seeds through burrowing. Broad scale tillage helps foster an “out of sight, out of mind” mentality. 肯定, the weeds for that season or that year may be gone but the seeds of their ancestors lie in wait to return with a vengeance.

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