“Marazanna’s themes are spring, weather, protection, winter, death, rebirth, cycles, change and growth. Her symbols are dolls (poppets) and water (including ice and snow). The Polish Goddess for whom this holiday is named represents an odd combination of winter, death and the fruit field’s growth and fertility. As such, She oversees the transitions we wish to make in our lives.
Marzanna is a Polish spring festival which an effigy of Marzanna is tossed into a river to overcome Her wintery nature and ensure that there will be no floods that year. This tradition is likely an antecedent of ancient river sacrifices made to appease the water spirits. Following suit, resolutely throw a biodegradable image of something you wish to overcome this season into any moving water source (even your toilet!). Let Marzenna carry it away, slowly breaking down that negative energy and replacing it with personal growth. Burying an image has the same effect.
To invoke Marzenna’s protection until next winter, write your name and birth date on a piece of paper and freeze it in an ice cube.
Keep the cube in a safe place in the back of your freezer to keep yourself surrounded by Marzenna’s safe barrier. Melt the ice cube later in the year if you need a boost of spring’s revitalizing energy.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
“Marazanna is a Slavic Goddess associated with death, winter and nightmares. Some sources equate her with the Latvian Goddess Māra, who takes a person’s body after their death. Some medieval Christian sources such as the Mater Verborum also compare Her to the Greek Goddess Hecate, associating Her with sorcery. The Polish chronicler Jan Długosz (15th cent.) likened Her to Ceres, the Roman Goddess of agriculture.”  “In pre-Christian times, She was also associated with the harvest. She was worshipped as the Mother and Goddess of corn and held in very special reverence. She appears as an old woman dressed in white who becomes a hag when winter hits and slowly dies off. She is sometimes associated with Witchcraft and divination.” 
The tradition of burning or drowning an effigy of Marzanna to celebrate the end of winter is a folk custom that survives in Poland, Slovakia and the Czech Republic. This folk custom falls always around the date of 20/21 March – at the vernal equinox when the Spring begins. The female straw effigy of Marzanna can vary in size – it may be a small puppet or a life-size dummy. The doll is set on fire, drowned in a river or both. The ritual is a symbolic farewell to Winter and the dark days that it involved. It shows joy of rebirth of Spring and victory over death. It was believed that the ritual would ensure good harvest. Destroying the effigy of evil Goddess was believed also to remove all the effects brought by Her. According to the custom the straw effigy was placed on a stick and covered with linen. She was also decorated with ribbons and necklaces. Village children would march with Marzanna – and branches of juniper in their hands – around the whole village. They would drown the Marzanna doll in every river (or generally every water – let it be river, pond or puddle) on the way. In the evening Marzanna effigy would be given to the village youth that would take her out of village and (in the light of burning juniper twigs) they would set a doll on fire and drown in the river. There were of course many superstitions connected with that custom. One could not touch Marzanna after it had been drowned in the river (as he would be in danger of losing the hand), looking back on the way back could bring serious disease and stumbling or falling down could predict death within the next year.
Christianity would forbid this Slavic custom. In 1420 Polish clergy was advised not to allow the villagers to celebrate ‘drowning of Marzanna’. When that would not help, the priests would invent their own habit to replace Marzanna custom with it. On Wednesday preceding Easter holidays an effigy of Judas would be thrown down from church tower. But that would not help either to forget about ‘Drowning of Marzanna’ habit.
Nowadays the ritual is kept within schools and kindergartens. During field trips children perform with their teachers ‘Drowning of Marzanna’ to prepare warm welcome to Spring.” 
Stella. Gods and Goddesses, “Goddess Marzanna“.
Swiech, Barbara. BellaOnline: The Voice of Women, “Slavic goddess and Spring“.
Rolek, Barbara. About.com, “The Drowning of Marzanna or Frost Maiden – Topienie Marzanny“.
Svätoslava. Slavorum: Perserving Slavic Heritage, “Burning Morena“. (Fabulous background information, photos and videos about Burning of Morena).