Elements of agriculture; a text Elements of agriculture; a text book for public schools elementsofagricu00shep Year: 1905 Fig. Ragweed. whence the name 'Kinghead.' These seeds are so difficult to remove from wheat that their presence in any quantity caus- es the grade to be reduced. It infests crops more particularly in low lands. The plants should be pulled the latter part of June or early in July, before the seeds have formed. (12) Canada Thistle. The aggressiveness, the rank growth, the ease of seed distribution, the in- crease of the plant by underground stems, and the spiny leaves make t
Elements of agriculture; a text Elements of agriculture; a text book for public schools elementsofagricu00shep Year: 1905 Fig. Ragweed. whence the name 'Kinghead.' These seeds are so difficult to remove from wheat that their presence in any quantity caus- es the grade to be reduced. It infests crops more particularly in low lands. The plants should be pulled the latter part of June or early in July, before the seeds have formed. (12) Canada Thistle. The aggressiveness, the rank growth, the ease of seed distribution, the in- crease of the plant by underground stems, and the spiny leaves make the Canada thistle dreaded above nearly all other plants, where known. It is a true thistle, and is distinguished from the prairie thistle by the leaves being a darker green, without prickles or hair on their upper sur- face, and by their heads having no prickly spines. It grows in very dense patches. It is held by some that this plant does not bear seed capable of growing. This is certainly not true of North Dakota plants. Although this plant grows from underground stems, its life depends ulti- mately upon the green leaves it produces above the Fig, Canada Thistle. Showing its method of growth from under-ground root stocks. New plants sprout up from every joint in this stock. See Experi- ment Station Bulletin No. 56.
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