It is done by snapping the shoot tip manually.
Nitrogen excess The plants exhibit heavy, rank growth, with large, dark green leaves that are often crisp and break easily. So these low natural enemies' similarities between marigold and onion indicate that not the same but different species were found on onion near attractive plants.
More common in the southern United States, the marigolds as well as many annual ornamentals are at risk if planted in soil heavily infested with nematodes.
For natural enemies these values are low Anyway the data of the association of marigold plants and onion crops will certainly help organic onion growers mainly in reducing the production costs. Only by addition of lime or iron sulfate Excessive potassium leaching may wash some quantity, but in clay soils removal may be almost impossible.
After the seedling emerges, the temperature should be reduced to F.