| Country/Region |
March-May (Spring) |
September-November (Autumn) |
| United Kingdom |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| France |
Late March to May most areas suitable |
September is suitable; Southern regions suitable in October-November |
| Italy |
Entire country, especially the south |
Entire country, especially the south; Northern regions suitable in September |
| Spain |
Entire country, especially the south |
Entire country, especially the south; some northern regions suitable |
| Germany |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Netherlands |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Belgium |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Austria |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Switzerland |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Poland |
Parts of May are suitable |
September is suitable; parts of October are suitable |
| Sweden |
Only some southern regions in May are suitable |
Only some southern regions in September are suitable |
| Norway |
Only some southern regions in May are suitable |
Only some southern regions in September are suitable |
| Canada |
Only parts of the West Coast (e.g., Vancouver) in May are suitable |
Parts of the West Coast and some Eastern regions (e.g., Toronto) in September are suitable |
