Alfazema vs. lavanda
In Portuguese, both alfazema and lavanda refer to the same plant genus (*Lavandula*). Botanically, they are synonyms. However, usage depends heavily on the region (Portugal vs. Brazil) and the context (natural plant vs. commercial product). Alfazema comes from Arabic and is deeply rooted in tradition, while lavanda comes from the Latin word for to wash and is often associated with the perfume industry and color.
Alfazema
B2Derived from the Arabic *al-huzama*, alfazema is the traditional term used in Portugal for the plant itself. It generally evokes the image of the raw herb, dried flowers, medicinal teas, or traditional remedies. In Brazil, it is also used in religious rituals to cleanse energy. You are more likely to hear alfazema when discussing gardening, grandma's drawer sachets, or herbal tea.
Minha avó sempre coloca saquinhos de alfazema nas gavetas.
(My grandmother always puts small bags of lavender in the drawers.)
O chá de alfazema é muito bom para a ansiedade.
(Lavender tea is very good for anxiety.)
Sentimos o cheiro de alfazema assim que entramos no jardim.
(We smelled the lavender as soon as we entered the garden.)
Vou tomar um banho de alfazema para relaxar.
(I am going to take a lavender bath to relax.)
As abelhas adoram as flores de alfazema.
(Bees love lavender flowers.)
Lavanda
B1Cognate with the English word lavender, lavanda is frequently used to describe manufactured scents, essential oils, and cleaning products (like detergents or air fresheners). Crucially, lavanda is also the specific word used to describe the light purple color; you would rarely say something is alfazema-colored. In Brazil, lavanda is very common everyday vocabulary, while in Portugal, it may refer more specifically to the processed scent or imported varieties.
Ela pintou as paredes do quarto de lavanda.
(She painted the bedroom walls lavender.)
Preciso comprar desinfetante com cheiro de lavanda.
(I need to buy disinfectant with a lavender scent.)
O óleo essencial de lavanda ajuda a dormir melhor.
(Lavender essential oil helps you sleep better.)
O vestido das madrinhas será tom de lavanda.
(The bridesmaids' dress will be a lavender shade.)
Esta colônia de lavanda é muito refrescante.
(This lavender cologne is very refreshing.)
Summary
While they are the same plant, use alfazema when talking about the living bush, dried flowers, teas, and traditions (especially in Portugal). Use lavanda when referring to the light purple color, essential oils, or commercial scents found in cleaning products and perfumes.