Field experiments were carried out in the Khorasn province (NE of Iran) in 2002 and 2003 by growing a bolting resistant variety (BR1).
This is the spinach-grower's bane, so buy bolt-resistant varieties if you can.
Beguiling full-color illustrations in John Scheepers Kitchen Garden Seeds (kitchengardenseeds.com) are a powerful attraction, so I add Avorio cardoons and bolt-resistant Indigo radicchio.
These lettuces tend to be larger, bolt-resistant and well-flavored.
Bolting resistance may be highly addictive because bolting-resistant cultivars have been developed by evolution.
These patterns suggest that the second hypothesis is a more appropriate explanation for the different bolting behaviours of the ten Welsh onion cultivars, namely, that the bolting-resistant plants may require more chilling hours than the plants susceptible to bolting.
It is found that improving connection deformation capacity, in particular, using fire resistant bolts, will enable very high temperatures to be resisted.
The conditions that resulted in late bolting and a low bolting rate were the use of a cultivar resistant to bolting, late sowing and transplantation in a low-temperature location.
There was no significant difference among the remaining six cultivars, and thus, it was inferred that C3 and C10 were highly resistant to bolting and were categorised as a strong bolting type, C6 and C8 were moderately susceptible to bolting and were classified as a moderate bolting type, C1 and C7 were highly susceptible to bolting and termed a weak bolting type.
Finally, the use of fire resistant steel bolts as a method to enhance the fire response was assessed, observing the benefits to these connections when the shank of the blind-bolt governs the failure.
Cultivars resistant to bolting can be sown earlier.
