The bulk of the acorn harvest comes from the holm oak (from November to February), but the season would be too short without the earlier harvests of Spanish oak and gall oak and the late cork oak season, which, between them, stretch the acorn-production period from September almost to April.
Quercus robur | Quercus ilex | Quercus petraea | Quercus alba | Quercus cerris | Quercus virginiana | Quercus rubra | Quercus garryana | Quercus acutissima | Quercus palustris | Quercus minima | Quercus fusiformis | Quercus castaneifolia | Quercus agrifolia | sand live oak (''Quercus geminata'') | Quercus × warei | ''Quercus'' × ''warei'' | Quercus suber | ''Quercus robur'' | Quercus peninsularis | Quercus lusitanica | Quercus lobata | Quercus laceyi | Quercus ilicifolia | Quercus hemisphaerica | Quercus havardii | Quercus glauca | Quercus frainetto | Quercus engelmannii | Quercus copeyensis |
Gall Oak (Quercus lusitanica) of Morocco, Portugal, and Spain.